Vulnerability · CVE-2026-96760
VU#762428: Authlib library contains a signature‑verification bypass vulnerability
Published Sep 28, 2026 · CERT/CC
Check if you run it
No confirmed exploitation is on record for CVE-2026-96760. EPSS is 0.28%. Act only if a listed version of CERT/CC is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Unknown—
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.28%
- Remediation
- Version ranges on file
- Affected products
- stated CERT/CC
Overview Authlib (versions up to and including 1.7.2) contain a signature‑verification bypass in the JSON Web Signature (JWS) general JSON serialization handling. The JsonWebSignature.deserialize_json() function accepts a JWS object with an empty "signatures" array and treats the payload as successfully verified, allowing attackers to supply arbitrary forged content without possessing any key material. Description Authlib is a Python library that provides tools for implementing OAuth, OpenID Connect, JWT/JWS/JWE (JSON Web
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- stated CERT/CC<= 1.7.2
How to fix CVE-2026-96760
Recommended remediation
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-96760. EPSS is 0.28%. Act only if a listed version of CERT/CC is installed.
Which versions are affected?
Compare what you have installed with CERT/CC <= 1.7.2. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 28, 2026 · CERT/CC Vulnerability Notes
Detected
Overview Authlib (versions up to and including 1.7.2) contain a signature‑verification bypass in the JSON Web Signature (JWS) general JSON serialization handling. The JsonWebSignature.deserialize_json() function accepts a JWS object with an empty "signatures" array and treats the payload as successfully verified, allowing attackers to supply arbitrary forged content without possessing any key mate
Sources
- CERT/CC Vulnerability NotesGovernment advisoryCVE-2026-96760
Overview Authlib (versions up to and including 1.7.2) contain a signature‑verification bypass in the JSON Web Signature (JWS) general JSON serialization handling. The JsonWebSignature.deserialize_json() function accepts a JWS object with an empty "signatures" array and treats the
kb.cert.org - CVE.orgVulnerability recordCVE-2026-96760
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-96760
30-day exploitation probability 0.3%
first.org
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.