CVE-2026-104056

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.

  • Published Oct 1, 2026
  • CVSS 9.8 critical
  • 0.1% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-104056 at the National Vulnerability Database