CVE-2026-7507

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat build of Keycloak 26.226.2.16-1 < *unaffected
Red HatRed Hat build of Keycloak 26.226.2-21 < *unaffected
Red HatRed Hat build of Keycloak 26.226.2-21 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4.12-1 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4-17 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4-17 < *unaffected

Weaknesses

  • CWE-290: Authentication Bypass by Spoofing

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

org.keycloak/keycloak-services: Session fixation in OIDC login flow that can lead to account takeover

Additional References

References