CVE-2026-121821

CORS Policy Bypass Enables Credentialed Data Disclosure in Armeria

Published Nov 6, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-942
Type Values Removed Values Added
First Time appeared Ly Corporation
Ly Corporation armeria
Vendors & Products Ly Corporation
Ly Corporation armeria
Type Values Removed Values Added
Title CORS Policy Bypass Enables Credentialed Data Disclosure in Armeria
Weaknesses CWE-200
CWE-284
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
LY-Corporation
Published
Updated
Nov 10, 2026, 5:26 PM
Reserved
Nov 4, 2026, 5:50 AM
Status
Deferred
Published
Nov 6, 2026, 8:17 AM
Modified
Nov 10, 2026, 6:17 PM