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THREAT OPS › Threat News › [NVD] CVE-2026-27962 (CRITICAL 9.1) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None

[NVD] CVE-2026-27962 (CRITICAL 9.1) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None

lownvdPublished 2026-03-16

CVE-2026-27962 CVSS: 9.1 CRITICAL Published: 2026-03-16T18:16:07.383

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization function, th

Indicators of compromise

CVE-2026-27962cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-27962