{"cve":"CVE-2026-7507","nvd":{"published":"2026-05-19T12:16:19.687","modified":"2026-10-26T13:10:00.140","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.5},"cwes":["CWE-290"],"references":["https://access.redhat.com/errata/RHSA-2026:19594","https://access.redhat.com/errata/RHSA-2026:19595","https://access.redhat.com/errata/RHSA-2026:19596","https://access.redhat.com/errata/RHSA-2026:19597","https://access.redhat.com/errata/RHSA-2026:76128"],"products":["redhat:build_of_keycloak"],"source":"nvd","synced_at":"2026-10-26T13:39:24.642594360+00:00"},"epss":{"cve":"CVE-2026-7507","score":0.00836,"percentile":0.57456,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-hf67-5vvq-fm3r","url":"https://osv.dev/vulnerability/GHSA-hf67-5vvq-fm3r","summary":"Keycloak: Session fixation in OIDC login flow that can lead to account takeover","modified":"2026-08-26T01:11:23.530962004Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","purl":"pkg:maven/org.keycloak/keycloak-services","ranges":["<26.6.2"],"fixed":["26.6.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}