CVE-2026-104056

State: Published
Severity: 9.8 Critical
Published: Oct 1, 2026
Updated: Oct 5, 2026
Reserved: Oct 1, 2026

Description

Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controlled values rather than endpoint URLs that share the origin of the configured server metadata URL.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity
CWE-346 Origin Validation Error
CWE-829 Inclusion of Functionality from Untrusted Control Sphere

Affected Products

Product	Versions
AuthlibAuthlib	1.7.2Affected

References

https://uziii2208.github.io/post/cve-2026-104056/

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