Authentication bypass via accepted unsigned SAML messages
Published Feb 26, 2024 · Updated Aug 26, 2025
Authentication bypass in LINE Corporation Armeria before 1.27.2 allows remote attackers to authenticate with forged unsigned SAML messages. The HTTP POST SAML path accepts unsigned assertions and logout requests because SamlMessageUtil does not require signature validation. Exploitation requires a deployed armeria-saml service provider with a reachable SAML endpoint and grants the forged identity access authorized by the consuming application.
Summary
What happened
Authentication bypass in LINE Corporation Armeria before 1.27.2 allows remote attackers to authenticate with forged unsigned SAML messages. The HTTP POST SAML path accepts unsigned assertions and logout requests because SamlMessageUtil does not require signature validation. Exploitation requires a deployed armeria-saml service provider with a reachable SAML endpoint and grants the forged identity access authorized by the consuming application.
The record
- CVE
- CVE-2024-1735
- Published
- Feb 26, 2024
- Updated
- Aug 26, 2025
- Vendor
- LINE Corporation
- Product
- Armeria
- Classifications
- CWE-304, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 26, 2024CVE publishedPublication date reported by the CVE source.
- Aug 26, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.69.0 <1.27.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo