Vulnerability-Lookup

CVE-2026-96760 (GCVE-0-2026-96760)

Vulnerability from cvelistv5 – Published: 2026-09-28 19:37 – Updated: 2026-10-01 13:58

Title

Authlib library contains a signature‑verification bypass vulnerability

Summary

Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-01 13:57 UTC

CWE

CWE-347 Improper Verification of Cryptographic Signature
CWE-670 Always-Incorrect Control Flow Implementation
CWE-358 Improperly Implemented Security Check for Standard
CWE-20 Improper Input Validation
CWE-347 - Improper Verification of Cryptographic Signature
CWE-670 - Always-Incorrect Control Flow Implementation
CWE-358 - Improperly Implemented Security Check for Standard
CWE-20 - Improper Input Validation

Assigner

certcc mitre root Scorecard

References

3 references

URL	Tags
https://github.com/authlib/authlib
https://kb.cert.org/vuls/id/762428
https://www.kb.cert.org/vuls/id/762428

Impacted products

1 product

Vendor	Product	Version
Authlib	Authlib	Affected: 1.7.2

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-96760

Vulnerability from fkie_nvd - Published: 2026-09-28 20:17 - Updated: 2026-10-01 14:17

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	cret@cert.org	https://github.com/authlib/authlib
	cret@cert.org	https://kb.cert.org/vuls/id/762428
	af854a3a-2127-422b-91ae-364da2661108	https://www.kb.cert.org/vuls/id/762428

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "product": "Authlib",
          "vendor": "Authlib",
          "versions": [
            {
              "status": "affected",
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        }
      ],
      "source": "cret@cert.org"
    }
  ],
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  ],
  "id": "CVE-2026-96760",
  "lastModified": "2026-10-01T14:17:32.147",
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GHSA-6M87-8WG6-HH8W

Vulnerability from github – Published: 2026-09-28 21:31 – Updated: 2026-10-01 15:30

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-96760"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-28T20:17:11Z",
    "severity": "CRITICAL"
  },
  "details": "Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.",
  "id": "GHSA-6m87-8wg6-hh8w",
  "modified": "2026-10-01T15:30:26Z",
  "published": "2026-09-28T21:31:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96760"
    },
    {
      "type": "WEB",
      "url": "https://github.com/authlib/authlib"
    },
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      "type": "WEB",
      "url": "https://kb.cert.org/vuls/id/762428"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/762428"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

UBUNTU-CVE-2026-96760 (CVE-2026-96760)

Vulnerability from osv_ubuntu – Published: 2026-09-28 20:17 – Updated: 2026-09-30 21:39 – Source website

Details

Severity

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-96760	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-96760	REPORT
	https://github.com/authlib/authlib	REPORT
	https://kb.cert.org/vuls/id/762428	REPORT
	https://www.kb.cert.org/vuls/id/762428	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-authlib",
            "binary_version": "0.15.5-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "python-authlib",
        "purl": "pkg:deb/ubuntu/python-authlib@0.15.5-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
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          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.15.4-1",
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      ]
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        "name": "python-authlib",
        "purl": "pkg:deb/ubuntu/python-authlib@1.3.0-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/noble"
      },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.1-1",
        "1.3.0-1",
        "1.3.0-1ubuntu0.1~esm1",
        "1.3.0-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-authlib",
            "binary_version": "1.6.7-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "python-authlib",
        "purl": "pkg:deb/ubuntu/python-authlib@1.6.7-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.0-1",
        "1.6.5-1",
        "1.6.6-1",
        "1.6.7-1",
        "1.6.7-1ubuntu0.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.",
  "id": "UBUNTU-CVE-2026-96760",
  "modified": "2026-09-30T21:39:34Z",
  "published": "2026-09-28T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-96760"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-96760"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/authlib/authlib"
    },
    {
      "type": "REPORT",
      "url": "https://kb.cert.org/vuls/id/762428"
    },
    {
      "type": "REPORT",
      "url": "https://www.kb.cert.org/vuls/id/762428"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-96760"
  ]
}

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-2026-96760 (GCVE-0-2026-96760)

FKIE_CVE-2026-96760

GHSA-6M87-8WG6-HH8W

UBUNTU-CVE-2026-96760 (CVE-2026-96760)

Tags

Sightings

Nomenclature

Related by attack behaviour