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EUVD-2026-250849

fkie_cve-2024-1735

A vulnerability has been identified in armeria-saml versions less than 1.27.2, allowing the use of malicious SAML messages to bypass authentication. All users who rely on armeria-saml older than version 1.27.2 must upgrade to 1.27.2 or later.

GHSA-4m6j-23p2-8c54 — Armeria SAML authentication bypass due to missing validation on unsigned SAML messages

Affected: Maven: com.linecorp.armeria:armeria-saml

### Impact

The SAML implementation provided by `armeria-saml` currently accepts unsigned SAML messages (assertions, logout requests, etc.) as they are, rather than rejecting them by default. As a result, an attacker can forge a SAML message to authenticate themselves, despite the fact that such an unsigned SAML message should be rejected.

### Patches

The vulnerability has been patched in Armeria version 1.27.2. All users who rely on `armeria-saml` older than version 1.27.2 must upgrade to 1.27.2 or later.

### Workarounds

There is no known workaround for this vulnerability.

### References

[`SamlMessageUtil.validateSignature()`](https://github.com/line/armeria/blob/0efc776988d71be4da6e506ec8a33c2b7b43f567/saml/src/main/java/com/linecorp/armeria/server/saml/SamlMessageUtil.java#L160-L163)

gsd-2024-1735

jvndb-2024-003108

Armeria-saml provided by LY Corporation contains an issue in handling SAML messages (CWE-304, CVE-2024-1735). LY Corporation reported this vulnerability to JPCERT/CC to notify users of its solution through JVN.