by Kastro
Paper/Archive/CVE-2026-104056

CVE-2026-104056

Authlib Authlib — CVE-2026-104056

EPSS 0.2%public exploitCVSS 9.8
critical.is priorityof 100
41
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 9.9.099 × 202.0Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Authlib1.7.2–CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploituziii2208.github.io/post/cve-2026-104056