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CVE-2026-7507— Org.keycloak/keycloak-services: session fixation in oidc login flow that can lead to account takeover

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.2
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，该漏洞源于登录操作端点存在会话固定问题，可能导致未经身份验证的攻击者劫持认证流程，造成账户接管。

CVSS 7.5 · High EPSS 0.76% · P54

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.2 26.2.16-1< * unaffected
26.2-21< * unaffected
26.2-21< * unaffected
Red Hat Red Hat build of Keycloak 26.2.16 any unaffected
Red Hat Red Hat build of Keycloak 26.4 26.4.12-1< * unaffected
26.4-17< * unaffected
26.4-17< * unaffected
Red Hat Red Hat build of Keycloak 26.4.12 any unaffected
Red Hat Red Hat Single Sign-On 7 any affected
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I. Basic Information for CVE-2026-7507

Vulnerability Information
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Vulnerability Title
Org.keycloak/keycloak-services: session fixation in oidc login flow that can lead to account takeover
Source: CVE Program / CVE List V5
Vulnerability Description
A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which processes session handles without adequate CSRF protection or cookie ownership validation—an attacker can reset the authentication flow state. This causes Single Sign-On (SSO) to authenticate the victim transparently upon clicking the link, allowing the attacker to hijack the required-action form without needing the victim's credentials. A successful exploit could lead to complete account takeover, including highly privileged administrative accounts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
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，该漏洞源于登录操作端点存在会话固定问题，可能导致未经身份验证的攻击者劫持认证流程，造成账户接管。
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 26.2 26.2.16-1 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-21 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2 26.2-21 ~ * cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.2.16 - cpe:/a:redhat:build_keycloak:26.2::el9
Red Hat Red Hat build of Keycloak 26.4 26.4.12-1 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4 26.4-17 ~ * cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat build of Keycloak 26.4.12 - cpe:/a:redhat:build_keycloak:26.4::el9
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-7507

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III. Intelligence Information for CVE-2026-7507

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Vendor Advisories for CVE-2026-7507 (6)

Same Patch Batch · Red Hat · 2026-05-19 · 10 CVEs total

CVE-2026-7504 8.1 HIGH Org.keycloak/keycloak-services: open redirect when using wildcard valid redirect uris in k
CVE-2026-7571 7.1 HIGH Keycloak: keycloak: access token disclosure and implicit flow bypass via forged client dat
CVE-2026-4630 6.8 MEDIUM Keycloak: keycloak: unauthorized resource access and data modification via insecure direct
CVE-2026-37982 6.8 MEDIUM Keycloak: org.keycloak.authentication: keycloak: unauthorized account takeover via webauth
CVE-2026-37979 6.5 MEDIUM Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience
CVE-2026-8922 5.4 MEDIUM Org.keycloak/keycloak-services: keycloak: org.keycloak.protocol.oidc: security flaw in org
CVE-2026-37978 4.9 MEDIUM Keycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admi
CVE-2026-8830 4.3 MEDIUM Keycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credenti
CVE-2026-37981 4.3 MEDIUM Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access c

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.2
Same vendor: Red Hat
Same weakness: CWE-290

V. Comments for CVE-2026-7507

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