CVE-2026-0707Keycloak: keycloak authorization header parsing leading to potential security control bypass
Updated under an hour ago ()
Does this affect you?
It affects Red Hat build of Keycloak 26.4. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A flaw was found in Keycloak. 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.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-551
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Deferred
- Record last updated
- Jun 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat build of Keycloak 26.4 redhat:build_keycloak | from 26.4.10-1 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:3947vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:3948vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-0707vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2427768issue-tracking, x-refsource-redhat
- https://github.com/keycloak/keycloak/issues/49433
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.