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CVE-2026-7507 is a session fixation vulnerability in Keycloak's OIDC authentication flow, specifically involving the login-actions restart mechanism in the keycloak-services component. The flaw arises because the /login-actions/restart endpoint accepts and processes attacker-controlled authentication session handles without adequate CSRF validation and without verifying that the referenced authentication session belongs to the browser initiating the request. An unauthenticated attacker can pre-create an authentication session, embed its handle in a crafted restart link, and induce a victim to visit that link. If the victim already has an active Single Sign-On session with the same Keycloak instance, Keycloak can transparently rebind the authentication flow to the attacker-created session context and silently authenticate the victim into it. The attacker can then hijack the resulting required-action flow and perform actions on behalf of the victim, resulting in account takeover. The issue was fixed in Keycloak 26.6.2 and later.
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No public exploit code observed for this vulnerability.
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5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Keycloak session fixation vulnerability mentioned only as part of vendor security history.
A Keycloak session fixation vulnerability in login actions endpoints, mentioned only as part of vendor security history.
A session fixation/authentication bypass vulnerability in Keycloak's /login-actions/restart endpoint that can let an unauthenticated attacker hijack a victim's SSO session and take over the victim account, including highly privileged accounts, when the victim clicks a crafted link and already has an active SSO session.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.