A vulnerability has been identified in armeria versions 0.84.0 through 1.42.0, where any-origin CORS policies do not enforce configured path restrictions, allowing an attacker-controlled website visited by an authenticated victim to read sensitive responses from excluded paths when credentials are enabled and the victim's browser sends authentication credentials.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Ly Corporation
  • Armeria

No data.

No data.

References
Link Providers
https://github.com/line/armeria/security/advisories/GHSA-386q-mrg6-jfj8 cve-icon cve-icon
https://line.github.io/security-advisory-blog/CVE-2026-121821/ cve-icon cve-icon
History

Fri, 06 Nov 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Ly Corporation
Ly Corporation armeria
Vendors & Products Ly Corporation
Ly Corporation armeria

Fri, 06 Nov 2026 09:45:00 +0000

Type Values Removed Values Added
Title CORS Policy Bypass Enables Credentialed Data Disclosure in Armeria
Weaknesses CWE-200
CWE-284

Fri, 06 Nov 2026 08:00:00 +0000

Type Values Removed Values Added
Description A vulnerability has been identified in armeria versions 0.84.0 through 1.42.0, where any-origin CORS policies do not enforce configured path restrictions, allowing an attacker-controlled website visited by an authenticated victim to read sensitive responses from excluded paths when credentials are enabled and the victim's browser sends authentication credentials.
References
Metrics cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: LY-Corporation

Published: 2026-11-06T07:46:50.787Z

Updated: 2026-11-06T07:46:50.787Z

Reserved: 2026-11-04T05:50:04.721Z

Link: CVE-2026-121821

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-06T08:17:20.577

Modified: 2026-11-06T20:36:20.133

Link: CVE-2026-121821

cve-icon Redhat

No data.