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Advisory record · GHSA-4m6j-23p2-8c54

Armeria SAML authentication bypass due to missing validation on unsigned SAML messages

CVSS 9.1 CriticalCriticalEPSS 0.0083 · 58th percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 26 Feb 2024, 20:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.linecorp.armeria:armeria-samlMaven<1.27.21.27.2
Identifiers
GHSA-4m6j-23p2-8c54 · CVE-2024-1735
Weakness (CWE)
CWE-287 · CWE-304
Tags
Published
26 Feb 2024
Updated
8 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Armeria's armeria-saml package, versions before 1.27.2, accepts unsigned SAML messages such as assertions and logout requests instead of rejecting them by default. An attacker can forge such a message to authenticate as another user without valid credentials. Upgrade to armeria-saml 1.27.2 or later; the source lists no workaround.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CNA (LY-Corporation)
  • CISA KEV Not listed.
  • EPSS 0.0083, the 58th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.