CVE-2026-23760 (GCVE-0-2026-23760)
Vulnerability from cvelistv5 – Published: 2026-01-22 14:35 – Updated: 2026-08-04 03:56 X_Known Exploited VulnerabilityTitle
SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
Summary
SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass vulnerability in the password reset API. The force-reset-password endpoint permits anonymous requests and fails to verify the existing password or a reset token when resetting system administrator accounts. An unauthenticated attacker can supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance. NOTE: SmarterMail system administrator privileges grant the ability to execute operating system commands via built-in management functionality, effectively providing administrative (SYSTEM or root) access on the underlying host.
Severity
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-22 00:00 UTC
CWE
- CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://www.smartertools.com/smartermail/release-… | release-notespatch |
| https://labs.watchtowr.com/attackers-with-decompi… | technical-descriptionexploit |
| https://code-white.com/public-vulnerability-list/… | third-party-advisory |
| https://www.vulncheck.com/advisories/smartertools… | third-party-advisory |
| https://www.huntress.com/blog/smartermail-account… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SmarterTools | SmarterMail |
Affected:
0 , < 100.0.9511
(custom)
cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:* |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 944358cf-bb4b-4fb9-ab35-6bfec425caa6
Exploited: Yes
Timestamps
First Seen: 2026-01-26
Asserted: 2026-01-26
Scope
Notes: SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability | Affected: SmarterTools / SmarterMail | Description: SmarterTools SmarterMail contains an authentication bypass using an alternate path or channel vulnerability in the password reset API. The force-reset-password endpoint permits anonymous requests and fails to verify the existing password or a reset token when resetting system administrator accounts. This could allow an unauthenticated attacker to supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-02-16 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://www.smartertools.com/smartermail/release-notes/current ; https://nvd.nist.gov/vuln/detail/CVE-2026-23760
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-288 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | SmarterMail |
| Due Date | 2026-02-16 |
| Date Added | 2026-01-26 |
| Vendorproject | SmarterTools |
| Vulnerabilityname | SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-10-02 08:09 CEST
| Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b1e6b62a-134a-4961-86de-687e144d8155
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API | Affected: SmarterTools / SmarterMail | CVSS: 9.3 (CRITICAL) | EPSS: 0.96544 | Used in malware: yes | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API |
| Cve Id | CVE-2026-23760 |
| Vendor | SmarterTools |
| Ghsa Id | None |
| Product | SmarterMail |
| Added Date | 2026-06-01T10:49:49.943Z |
| Cvss Score | 9.3 |
| Epss Score | 0.96544 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99881 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2026-23760 |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:09 CEST
| Updated: 2026-10-02 09:09 CEST
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]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-288",
"description": "CWE-288 Authentication Bypass Using an Alternate Path or Channel",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-05T01:30:23.457Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"tags": [
"release-notes",
"patch"
],
"url": "https://www.smartertools.com/smartermail/release-notes/current"
},
{
"tags": [
"technical-description",
"exploit"
],
"url": "https://labs.watchtowr.com/attackers-with-decompilers-strike-again-smartertools-smartermail-wt-2026-0001-auth-bypass/"
},
{
"tags": [
"third-party-advisory"
],
"url": "https://code-white.com/public-vulnerability-list/#authenticationserviceforceresetpassword-missing-authentication-in-smartermail"
},
{
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/smartertools-smartermail-authentication-bypass-via-password-reset-api"
}
],
"source": {
"discovery": "UNKNOWN"
},
"tags": [
"x_known-exploited-vulnerability"
],
"title": "SmarterTools SmarterMail \u003c Build 9511 Authentication Bypass via Password Reset API",
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-23760",
"datePublished": "2026-01-22T14:35:17.235Z",
"dateReserved": "2026-01-15T18:42:20.938Z",
"dateUpdated": "2026-08-04T03:56:03.047Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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