PT-2026-2984 · Red Hat · Keycloak

Published 2026-01-15 · Updated 2026-01-17 · CVE-2026-0976

Positive Technologies (AI Summary)

CVSS v3.1

3.7

Low

Base vector

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

Name of the Vulnerable Software and Affected Versions Keycloak (affected versions not specified)

Description A flaw exists in Keycloak related to improper input validation. The software accepts RFC-compliant matrix parameters within URL path segments, which may be ignored or mishandled by common reverse proxy configurations. This allows a remote attacker to craft requests that mask path segments, potentially bypassing proxy-level path filtering. This could expose administrative or sensitive endpoints that operators believe are not externally reachable.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-0976

GHSA-V897-PV23-R8CW

Affected Products

Keycloak

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-0976 · Security Note
• https://osv.dev/vulnerability/GHSA-v897-pv23-r8cw · Vendor Advisory
• https://github.com/keycloak/keycloak · Note
• https://twitter.com/VulmonFeeds/status/2011836015032307898 · Twitter Post
• https://bugzilla.redhat.com/show_bug.cgi?id=2429869 · Note
• https://twitter.com/CVEnew/status/2012490381238095970 · Twitter Post
• https://access.redhat.com/security/cve/CVE-2026-0976 · Note