PT-2026-1976 · Red Hat · Keycloak

Guanping Zhang · Published 2026-01-08 · Updated 2026-03-05 · CVE-2026-0707

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

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

Description The Keycloak Authorization header parser is overly permissive regarding the formatting of the "Bearer" authentication scheme. It accepts non-standard characters, such as tabs, as separators and tolerates case variations that deviate from RFC 6750 specifications. This could potentially lead to a security control bypass.

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

Weakness Enumeration

CWE-551

Related Identifiers

CVE-2026-0707

GHSA-GV94-WP4H-VV8P

Affected Products

Keycloak

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2026-0707 · Security Note
• https://access.redhat.com/errata/RHSA-2026:3948 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-gv94-wp4h-vv8p · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:3947 · Vendor Advisory
• https://github.com/keycloak/keycloak · Note
• https://t.me/cveNotify/154406 · Telegram Post
• https://twitter.com/CVEnew/status/2009149972399501774 · Twitter Post
• https://bugzilla.redhat.com/show_bug.cgi?id=2427768 · Note
• https://t.me/cveNotify/154393 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2009201152521379901 · Twitter Post
• https://access.redhat.com/security/cve/CVE-2026-0707 · Note
• https://t.me/CVEtracker/41676 · Telegram Post