Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect (OIDC) ID Tokens. Specifically, the internal hash verification logic (_verify_hash) responsible for validating the at_hash (Access Token Hash) and c_hash (Authorization Code Hash) claims exhibits a fail-open behavior when encountering an unsupported or unknown cryptographic algorithm. This flaw allows an attacker to bypass mandatory integrity protections by supplying a forged ID Token with a deliberately unrecognized alg header parameter. The library intercepts the unsupported state and silently returns True (validation passed), inherently violating fundamental cryptographic design principles and direct OIDC specifications. This issue has been patched in version 1.6.9.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
| Date | Total | Labels |
|---|
| 2026-03-16 | 2 | Disclosure1General1 |
| 2026-03-17 | 1 | Disclosure1 |
CVE-2026-28498 Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python … https://www.cve.org/CVERecord?id=CVE-2026-28498
Post summary
The text announces a vulnerability in Authlib (CVE‑2026‑28498) that existed before v1.6.9, implying that version 1.6.9 includes a fix.
🚨 CYBERDUDEBIVASH SENTINEL APEX ALERT 🚨 Threat: CVE-2026-28498 - Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding Intel Report: https://ift.tt/Rq5FsW1
Post summary
A threat alert has been issued for CVE-2026-28498, describing a fail‑open OIDC hash binding verification flaw in Authlib, with an intel report link provided.
🚨 CYBERDUDEBIVASH SENTINEL APEX ALERT 🚨 Threat: CVE-2026-28498 - Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding Intel Report: https://ift.tt/1rJMkOt
Post summary
The alert announces the CVE-2026-28498 vulnerability, describes it as a fail-open cryptographic verification issue in Authlib’s OIDC hash binding, and links to an Intel Report, but it provides no evidence of exploitation, tooling, or remediation.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | authlib | authlib | - | - | - |