CVE-2026-0976

LOW

3.7

Description

A flaw was found in Keycloak. This improper input validation vulnerability occurs because Keycloak accepts RFC-compliant matrix parameters in URL path segments, while common reverse proxy configurations may ignore or mishandle them. A remote attacker can craft requests to mask path segments, potentially bypassing proxy-level path filtering. This could expose administrative or sensitive endpoints that operators believe are not externally reachable.

CVE Details

CVSS v3.1 Score3.7

SeverityLOW

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published1/15/2026

Last Modified1/16/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-20

References

https://access.redhat.com/security/cve/CVE-2026-0976(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2429869(secalert@redhat.com)

IOC Correlations

No correlations recorded

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