CVE-2026-96760 Authlib - Authentication Bypass

Authlib <= 1.7.2 contains a signature verification bypass caused by JsonWebSignature.deserialize_json() method accepting JSON Serialization JWS objects without signature or key verification, letting attackers bypass signature verification, exploit requires crafted JSON Serialization JWS object.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.28% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
28 September 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to the latest version beyond 1.7.2.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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