Vulnerability-Lookup

CVE-2026-57495 (GCVE-0-2026-57495)

Vulnerability from cvelistv5 – Published: 2026-07-20 22:09 – Updated: 2026-07-22 13:53

Title

AgenticMail: Unauthenticated inbound mail triggers bypassPermissions resume of the operator's Claude Code session (bridge-wake)

Summary

AgenticMail gives AI agents real email addresses and phone numbers. In @agenticmail/claudecode prior to version 0.2.39, @agenticmail/codex prior to version 0.1.33, @agenticmail/core prior to version 0.9.43, and @agenticmail/openclaw prior to version 0.5.71, two inbound-mail handlers act on a privileged effect without verifying that the sender is the operator, while a sibling handler in the same repo does. The higher-impact one: any external email routed to the bridge inbox causes the dispatcher to resume the operator's Claude Code session with `permissionMode: 'bypassPermissions'`, embedding the attacker-controlled `from`/`subject`/`preview` verbatim into the prompt the resumed agent reads — an indirect prompt injection into a fully-privileged agent (Bash/Write/Edit/WebFetch + the agenticmail MCP toolbelt) running as the operator's OAuth identity. The sibling operator-query email-reply hook gates the same untrusted-From provenance with `isOperatorReplySender(replyFrom, config.operatorEmail)` (fail-closed); the bridge-wake path — a strictly higher-privilege effect — has no equivalent. @agenticmail/claudecode 0.2.39, @agenticmail/codex 0.1.33, @agenticmail/core 0.9.43, and @agenticmail/openclaw 0.5.71 contain a fix.

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-22 13:53 UTC

CWE

CWE-306 - Missing Authentication for Critical Function

Assigner

GitHub_M mitre root Scorecard

References

1 reference

URL	Tags
https://github.com/agenticmail/agenticmail/securi…	x_refsource_CONFIRM

Impacted products

4 products

Vendor	Product	Version
agenticmail	@agenticmail/core	Affected: < 0.9.43
agenticmail	@agenticmail/claudecode	Affected: < 0.2.39
agenticmail	@agenticmail/codex	Affected: < 0.1.33
agenticmail	@agenticmail/openclaw	Affected: < 0.5.71

Show details on NVD website

JSON

To clipboard

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EUVD-2026-339341

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:54

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:54:10.841915+00:00",
  "id": "EUVD-2026-339341"
}

FKIE_CVE-2026-57495

Vulnerability from fkie_nvd - Published: 2026-07-20 22:17 - Updated: 2026-07-23 15:54

Severity

8.2 (High) - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/agenticmail/agenticmail/security/advisories/GHSA-fq4x-789w-jg5h

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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          "product": "@agenticmail/core",
          "vendor": "agenticmail",
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          ]
        },
        {
          "product": "@agenticmail/claudecode",
          "vendor": "agenticmail",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.2.39"
            }
          ]
        },
        {
          "product": "@agenticmail/codex",
          "vendor": "agenticmail",
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            }
          ]
        },
        {
          "product": "@agenticmail/openclaw",
          "vendor": "agenticmail",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.5.71"
            }
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    }
  ],
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    }
  ],
  "id": "CVE-2026-57495",
  "lastModified": "2026-07-23T15:54:18.643",
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          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-57495",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-22T13:53:32.879212Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-20T22:17:17.107",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/agenticmail/agenticmail/security/advisories/GHSA-fq4x-789w-jg5h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-FQ4X-789W-JG5H

Vulnerability from github – Published: 2026-06-18 17:21 – Updated: 2026-07-21 13:41

Summary

AgenticMail: Unauthenticated inbound mail triggers bypassPermissions resume of the operator's Claude Code session (bridge-wake)

Details

Summary

Two inbound-mail handlers act on a privileged effect without verifying that the sender is the operator, while a sibling handler in the same repo does. The higher-impact one: any external email routed to the bridge inbox causes the dispatcher to resume the operator's Claude Code session with permissionMode: 'bypassPermissions', embedding the attacker-controlled from/subject/preview verbatim into the prompt the resumed agent reads — an indirect prompt injection into a fully-privileged agent (Bash/Write/Edit/WebFetch + the agenticmail MCP toolbelt) running as the operator's OAuth identity. The sibling operator-query email-reply hook gates the same untrusted-From provenance with isOperatorReplySender(replyFrom, config.operatorEmail) (fail-closed); the bridge-wake path — a strictly higher-privilege effect — has no equivalent.

Affected code (current HEAD, commit b95f52e)

Untrusted provenance: external inbound email enters at packages/api/src/routes/inbound.ts:41 (POST /mail/inbound); the x-inbound-secret authenticates only the relay->API hop, not the external sender, so from/subject/preview are attacker-controlled.

Privileged sink (bridge-wake, bypassPermissions): - packages/claudecode/src/dispatcher.ts:2040 handleBridgeMail extracts subject/from/preview (:2045-2049) and calls planBridgeWake({ session, mail: { ..., from, preview } }) (:2052) with NO sender check — routing keys only on session freshness (skip-live / escalate / resume). - planBridgeWake -> packages/core/src/host-bridge.ts:141 composeBridgeWakePrompt embeds the untrusted from/subject/preview (preview sliced to 600 chars at :144) verbatim into the prompt. - packages/claudecode/src/bridge-wake.ts:103 resumeBridgeSession runs the prompt via the Claude Code SDK with permissionMode: 'bypassPermissions' against the operator's last session (resume + same mcpServers).

Guarded sibling (same class, authenticated): packages/api/src/routes/inbound.ts:102 rejects an operator-query email reply unless isOperatorReplySender(replyFrom, config.operatorEmail) (def packages/core/src/phone/realtime-tools.ts:999, fail-closed when no operatorEmail), with a v0.9.53 security-review comment (inbound.ts:93-100) stating inbound mail provenance is untrusted and an emailed answer is only honored when its From matches the configured operator. The Telegram sibling likewise gates on operatorChatId. The bridge-wake path ignores this exact lesson.

Secondary instance (same root cause): packages/core/src/gateway/manager.ts:261 tryProcessApprovalReply releases a held outbound email on an "approve" reply matched only by In-Reply-To / notification_message_id, with no sender check — again unlike the isOperatorReplySender sibling.

Impact

In a configured headless-bridge deployment (operator uses the CLI so a host-session is saved; session fresh <24h per host-sessions.ts:127; external mail routed to the bridge inbox via relay sub-addressing or a Cloudflare webhook), an external sender achieves indirect prompt injection into a bypassPermissions operator session -> arbitrary OS command execution, filesystem read/write, and exfiltration under the operator's OAuth identity. The auth gap (no sender check on the bridge path) is structural and unconditional; the impact realization is config-conditional and depends on the resumed model following injected instructions.

Proof of concept (static / request-difference; dynamic on operator's OWN setup only)

Static: the from/subject/preview extracted at dispatcher.ts:2045-2049 flow into composeBridgeWakePrompt (host-bridge.ts:141) and resumeBridgeSession (bridge-wake.ts:103) with no interposed sender check, while the sibling inbound.ts:102 has one — the same untrusted-From provenance is authenticated on one privileged email path and not on the higher-privileged one. Dynamic (own instance only): with a configured bridge + fresh host-session, send mail from a non-operator address into the bridge inbox whose subject/preview contains a benign instruction writing a fresh CSPRNG marker; observe the resumed bypassPermissions session act on it. Use only your own instance; do not target third-party deployments.

Suggested fix

Mirror the guarded sibling: before any bypassPermissions resume (dispatcher.ts handleBridgeMail, before planBridgeWake), require trusted provenance — an internal sub-agent wake OR isOperatorReplySender(from, config.operatorEmail); otherwise deliver the mail normally but do NOT resume. Reuse the existing exported isOperatorReplySender from @agenticmail/core so the two privileged email paths share one authentication helper. Defense-in-depth: in composeBridgeWakePrompt, wrap the untrusted fields in explicit untrusted-data delimiters and drop bypassPermissions for mail-triggered resumes whose provenance is not the operator. Apply the same sender gate to tryProcessApprovalReply (manager.ts:261).

Affected versions

Present on current HEAD (core 0.9.42 / claudecode 0.2.38, commit b95f52e). No fix retrofits the sender check onto bridge-wake.

Severity (honest, both ways)

HIGH, plausibly CRITICAL in a configured headless-bridge deployment. Ceiling ~9.0 (unauthenticated external sender -> operator-privileged code execution). Floor ~7.0: the auth gap is unconditional, but full impact requires (1) a fresh <24h host-session, (2) external mail routed to the bridge inbox, (3) the resumed model obeying injected instructions (non-deterministic). Not a deterministic RCE primitive. CWE-306 (missing authentication for the privileged action) + CWE-77/CWE-94 (injected instructions realized as command execution). Novelty: the two existing agenticmail advisories (CVE-2026-50287 MCP missing-auth; CVE-2026-47255 storage SQL) do not cover this sink. Please rate per your deployment assumptions.

Severity

8.2 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

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To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@agenticmail/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.43"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@agenticmail/claudecode"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.39"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@agenticmail/codex"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.1.33"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@agenticmail/openclaw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.71"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-57495"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-18T17:21:27Z",
    "nvd_published_at": "2026-07-20T22:17:17Z",
    "severity": "HIGH"
  },
  "details": "## Summary\nTwo inbound-mail handlers act on a privileged effect without verifying that the sender is the operator, while a sibling handler in the same repo does. The higher-impact one: any external email routed to the bridge inbox causes the dispatcher to resume the operator\u0027s Claude Code session with `permissionMode: \u0027bypassPermissions\u0027`, embedding the attacker-controlled `from`/`subject`/`preview` verbatim into the prompt the resumed agent reads \u2014 an indirect prompt injection into a fully-privileged agent (Bash/Write/Edit/WebFetch + the agenticmail MCP toolbelt) running as the operator\u0027s OAuth identity. The sibling operator-query email-reply hook gates the same untrusted-From provenance with `isOperatorReplySender(replyFrom, config.operatorEmail)` (fail-closed); the bridge-wake path \u2014 a strictly higher-privilege effect \u2014 has no equivalent.\n\n## Affected code (current HEAD, commit b95f52e)\nUntrusted provenance: external inbound email enters at `packages/api/src/routes/inbound.ts:41` (POST /mail/inbound); the `x-inbound-secret` authenticates only the relay-\u003eAPI hop, not the external sender, so `from`/`subject`/`preview` are attacker-controlled.\n\nPrivileged sink (bridge-wake, bypassPermissions):\n- `packages/claudecode/src/dispatcher.ts:2040` `handleBridgeMail` extracts `subject`/`from`/`preview` (`:2045-2049`) and calls `planBridgeWake({ session, mail: { ..., from, preview } })` (`:2052`) with NO sender check \u2014 routing keys only on session freshness (skip-live / escalate / resume).\n- `planBridgeWake` -\u003e `packages/core/src/host-bridge.ts:141` `composeBridgeWakePrompt` embeds the untrusted `from`/`subject`/`preview` (preview sliced to 600 chars at `:144`) verbatim into the prompt.\n- `packages/claudecode/src/bridge-wake.ts:103` `resumeBridgeSession` runs the prompt via the Claude Code SDK with `permissionMode: \u0027bypassPermissions\u0027` against the operator\u0027s last session (resume + same mcpServers).\n\nGuarded sibling (same class, authenticated): `packages/api/src/routes/inbound.ts:102` rejects an operator-query email reply unless `isOperatorReplySender(replyFrom, config.operatorEmail)` (def `packages/core/src/phone/realtime-tools.ts:999`, fail-closed when no operatorEmail), with a v0.9.53 security-review comment (`inbound.ts:93-100`) stating inbound mail provenance is untrusted and an emailed answer is only honored when its From matches the configured operator. The Telegram sibling likewise gates on `operatorChatId`. The bridge-wake path ignores this exact lesson.\n\nSecondary instance (same root cause): `packages/core/src/gateway/manager.ts:261` `tryProcessApprovalReply` releases a held outbound email on an \"approve\" reply matched only by `In-Reply-To` / `notification_message_id`, with no sender check \u2014 again unlike the `isOperatorReplySender` sibling.\n\n## Impact\nIn a configured headless-bridge deployment (operator uses the CLI so a host-session is saved; session fresh \u003c24h per `host-sessions.ts:127`; external mail routed to the bridge inbox via relay sub-addressing or a Cloudflare webhook), an external sender achieves indirect prompt injection into a `bypassPermissions` operator session -\u003e arbitrary OS command execution, filesystem read/write, and exfiltration under the operator\u0027s OAuth identity. The auth gap (no sender check on the bridge path) is structural and unconditional; the impact realization is config-conditional and depends on the resumed model following injected instructions.\n\n## Proof of concept (static / request-difference; dynamic on operator\u0027s OWN setup only)\nStatic: the from/subject/preview extracted at dispatcher.ts:2045-2049 flow into composeBridgeWakePrompt (host-bridge.ts:141) and resumeBridgeSession (bridge-wake.ts:103) with no interposed sender check, while the sibling inbound.ts:102 has one \u2014 the same untrusted-From provenance is authenticated on one privileged email path and not on the higher-privileged one. Dynamic (own instance only): with a configured bridge + fresh host-session, send mail from a non-operator address into the bridge inbox whose subject/preview contains a benign instruction writing a fresh CSPRNG marker; observe the resumed bypassPermissions session act on it. Use only your own instance; do not target third-party deployments.\n\n## Suggested fix\nMirror the guarded sibling: before any `bypassPermissions` resume (dispatcher.ts handleBridgeMail, before planBridgeWake), require trusted provenance \u2014 an internal sub-agent wake OR `isOperatorReplySender(from, config.operatorEmail)`; otherwise deliver the mail normally but do NOT resume. Reuse the existing exported `isOperatorReplySender` from @agenticmail/core so the two privileged email paths share one authentication helper. Defense-in-depth: in composeBridgeWakePrompt, wrap the untrusted fields in explicit untrusted-data delimiters and drop `bypassPermissions` for mail-triggered resumes whose provenance is not the operator. Apply the same sender gate to `tryProcessApprovalReply` (manager.ts:261).\n\n## Affected versions\nPresent on current HEAD (core 0.9.42 / claudecode 0.2.38, commit b95f52e). No fix retrofits the sender check onto bridge-wake.\n\n## Severity (honest, both ways)\nHIGH, plausibly CRITICAL in a configured headless-bridge deployment. Ceiling ~9.0 (unauthenticated external sender -\u003e operator-privileged code execution). Floor ~7.0: the auth gap is unconditional, but full impact requires (1) a fresh \u003c24h host-session, (2) external mail routed to the bridge inbox, (3) the resumed model obeying injected instructions (non-deterministic). Not a deterministic RCE primitive. CWE-306 (missing authentication for the privileged action) + CWE-77/CWE-94 (injected instructions realized as command execution). Novelty: the two existing agenticmail advisories (CVE-2026-50287 MCP missing-auth; CVE-2026-47255 storage SQL) do not cover this sink. Please rate per your deployment assumptions.",
  "id": "GHSA-fq4x-789w-jg5h",
  "modified": "2026-07-21T13:41:07Z",
  "published": "2026-06-18T17:21:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/agenticmail/agenticmail/security/advisories/GHSA-fq4x-789w-jg5h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57495"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/agenticmail/agenticmail"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AgenticMail: Unauthenticated inbound mail triggers bypassPermissions resume of the operator\u0027s Claude Code session (bridge-wake)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-57495 (GCVE-0-2026-57495)

EUVD-2026-339341

FKIE_CVE-2026-57495

GHSA-FQ4X-789W-JG5H

Summary

Affected code (current HEAD, commit b95f52e)

Impact

Proof of concept (static / request-difference; dynamic on operator's OWN setup only)

Suggested fix

Affected versions

Severity (honest, both ways)

Tags

Sightings

Nomenclature

Related by attack behaviour