Intel

AIKIDO-2026-235725

ash_authentication is vulnerable to Improper Verification of Cryptographic Signature

Improper Verification of Cryptographic SignatureCVE-2026-78223 Published 2 days ago

69

Medium Risk

This Affects:

ELIXIRash_authentication
0.2.0 - 4.14.2
Fixed in 4.15.0
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TL;DR

In ash_authentication, token revocation record built from unverified JWT claims in AshAuthentication. AshAuthentication.TokenResource.RevokeTokenChange.change/3 reads the :token argument and decodes it with AshAuthentication.Jwt.peek/1, which delegates to Joken.peek_claims/1 and performs no signature check, unlike Jwt.verify/4. The jti, exp and sub claims it returns are written straight onto the revocation record, guarded only by byte_size(token) > 0.

Who does this affect?

You are affected if you are using a version that falls within the vulnerable range.

Background info

ash_authentication is vulnerable to Improper Verification of Cryptographic Signature in versions 0.2.0 - 4.14.2.

How to fix this

Upgrade the ash_authentication library to the patch version.

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