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Medium

Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

  • Disclosed: 08.01.2026
  • Updated: 11.10.2026 12:22

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.

Affected software

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PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.keycloak:keycloak-parent <= 26.5.0 no fix

References

CVSS score 5.3/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE)
CWE-551
Platform
Java / Kotlin (Maven)
Package
org.keycloak:keycloak-parent
Disclosed
08.01.2026
Updated
11.10.2026 12:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-gv94-wp4h-vv8p - CC BY 4.0

Vulnerability history: org.keycloak:keycloak-parent

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (26) in the archive
Total entries
26
First → latest
05.2021 02.2026
Without a fix
6
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 12
  • Medium 10
  • Low 2

Disclosures per year

Severity:
  1. Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization this entry
    Medium · 5.3 CVE-2026-0707 <= 26.5.0 no fix
  2. Keycloak Cross-site Scripting on OpenID connect login service
    High · 8.1 CVE-2022-4137 < 20.0.5 20.0.5
  3. Keycloak vulnerable to path traversal via double URL encoding
    Critical · 9.1 CVE-2022-3782 < 20.0.2 20.0.2
  4. Keycloak SAML javascript protocol mapper: Uploading of scripts through admin console
    High · 7.2 CVE-2022-2668 < 19.0.2 19.0.2
  5. Incorrect implementation of lockout feature in Keycloak
    High · 7.5 CVE-2021-3513 < 13.0.0 13.0.0
  6. Visualizer: Tables and Charts Manager for WordPress <= 3.7.9 - Authenticated (Contributor+) PHAR Deserialization
    High · 8.8 CVE-2022-2256 < 19.0.2 19.0.2
  7. Keycloak Authentication Error
    Critical · 9.8 CVE-2019-14910 >= 7.0.0, <= 7.0.1 no fix
  8. Keycloak Authentication Error
    High · 8.3 CVE-2019-14909 >= 7.0.0, <= 7.0.1 no fix
  9. Keycloak CSRF Vulnerability
    High · 7.5 CVE-2017-12159 < 3.4.0 3.4.0
  10. Keycloak Oauth Implementation Error
    High · 7.2 CVE-2017-12160 < 3.3.0.Final 3.3.0.Final
  11. Keycloak Improper Bruteforce Detection
    High · 8.1 CVE-2018-14657 < 4.6.0.Final 4.6.0.Final
  12. Keycloak insufficient session expiration
    High · 7.1 CVE-2021-3461 < 14.0.0 14.0.0
  13. Path Traversal
    High · 7.5 CVE-2020-14366 < 12.0.0 12.0.0
  14. Allocation of Resources Without Limits or Throttling in Keycloak
    High · 7.5 CVE-2020-10758 < 11.0.1 11.0.1
  15. Code injection in keycloak
    High · 8.3 CVE-2021-20222 >= 9.0.0, < 12.0.3 12.0.3

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