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Fencer Vulns
medium 5.3

CVE-2026-0707 json

Keycloak: keycloak authorization header parsing leading to potential security control bypass

published 2026-01-08 10 mo ago modified 2026-10-26 13 d ago also GHSA-gv94-wp4h-vv8p , EUVD-2026-1461

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat build of Keycloak 26.4 26.4-12, 26.4.10-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-0707 updated cvss 5.3

keycloak: Keycloak Authorization Header Parsing Leading to Potential Security Control Bypass

  • Red Hat build of Keycloak 26.4 rhbk/keycloak-rhel9 26.4-12, rhbk/keycloak-rhel9-operator 26.4-12, rhbk/keycloak-operator-bundle 26.4.10-1
    fixed: vendor fix RHSA-2026:3948
  • Red Hat build of Keycloak 26.4.10
    fixed: vendor fix RHSA-2026:3947

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-parent
<=26.5.0
 no fix listed

Affected products

  • Red Hat Red Hat build of Keycloak 26.4
  • Red Hat Red Hat build of Keycloak 26.4.10

Classification

Weakness
  • CWE-551 Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.