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CVE-2026-0707— Keycloak: keycloak authorization header parsing leading to potential security control bypass

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于Authorization标头解析器对Bearer认证方案格式过于宽松，可能导致非标准字符被接受。

CVSS 5.3 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.4 26.4.10-1< * unaffected
26.4-12< * unaffected
26.4-12< * unaffected
Red Hat Red Hat build of Keycloak 26.4.10 any unaffected
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I. Basic Information for CVE-2026-0707

Vulnerability Information
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Vulnerability Title
Keycloak: keycloak authorization header parsing leading to potential security control bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序：在解析与净化处理之前进行授权
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak开源的一种开源身份和访问管理解决方案。 Keycloak存在安全漏洞，该漏洞源于Authorization标头解析器对Bearer认证方案格式过于宽松，可能导致非标准字符被接受。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.4 26.4.10-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-12 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-12 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.10 - cpe:/a:redhat:build_keycloak:26.4::el9

II. Public POCs for CVE-2026-0707

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III. Intelligence Information for CVE-2026-0707

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Patches & Fixes for CVE-2026-0707 (1)

Vendor Advisories for CVE-2026-0707 (4)

Same Patch Batch · Red Hat · 2026-01-08 · 3 CVEs total

CVE-2026-0719 8.6 HIGH Libsoup: signed to unsigned conversion error leading to stack-based buffer overflow in lib
CVE-2025-14025 8.5 HIGH Ansible-automation-platform/aap-gateway: aap-gateway: read-only personal access token (pat

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.4
Same vendor: Red Hat
Same weakness: CWE-551

V. Comments for CVE-2026-0707

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