---
title: "CVE-2024-1735: Armeria SAML authentication bypass due to missing validation on unsigned SAML messages"
url: https://erroneo.us/security/cve/CVE-2024-1735/
description: "CVE-2024-1735 (com.linecorp.armeria:armeria-saml (Maven)): A vulnerability has been identified in armeria-saml versions less than 1.27.2, allowing the use…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-02-26
date_modified: 2026-03-15
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-1735"
kev: false
cvss: 9.1
epss: 0.00834
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-1735: Armeria SAML authentication bypass due to missing validation on unsigned SAML messages

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.8% , percentile 57: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 57% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes com.linecorp.armeria:armeria-saml (Maven) <= 1.27.1, fixed in 1.27.2 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Maven `com.linecorp.armeria:armeria-saml` <= 1.27.1 → fixed: 1.27.2

## Affected products (CVE record)

- LINE Corporation Armeria: 0.69.0 < 1.27.2

## Severity

- LY-Corporation CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.83% probability of exploitation activity in the next 30 days; percentile 57.

## Sources

- [GitHub Advisory GHSA-4m6j-23p2-8c54](https://github.com/advisories/GHSA-4m6j-23p2-8c54)
- [CVE.org record CVE-2024-1735](https://www.cve.org/CVERecord?id=CVE-2024-1735)
- [NVD entry CVE-2024-1735](https://nvd.nist.gov/vuln/detail/CVE-2024-1735)
- [github.com](https://github.com/line/armeria/security/advisories/GHSA-4m6j-23p2-8c54)
- [github.com](https://github.com/line/armeria/commit/b2aa9f49b46a7b0e03d8b8d753809cd1e8e2016c)
- [github.com](https://github.com/line/armeria/blob/0efc776988d71be4da6e506ec8a33c2b7b43f567/saml/src/main/java/com/linecorp/armeria/server/saml/SamlMessageUtil.java#L160-L163)
- [github.com](https://github.com/line/armeria/releases/tag/armeria-1.27.2)

---
Source page: https://erroneo.us/security/cve/CVE-2024-1735/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt