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Vulnerability record · CVE-2026-7507 · published 19 May 2026

CVE-2026-7507: Redhat build of keycloak authentication bypass by spoofing vulnerability

Redhat · Build Of Keycloak

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.

7.5 CVSS 3.1 High EPSS 0.76% · top 46.6% CWE-290 · Authentication bypass by spoofing
7.5CVSS 3.1 base score
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
13References
15 Jul 2026Last modified by NVD

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:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:19594 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19595 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19596 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19597 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-7507 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2464145 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19594 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19595 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19596 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:19597 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-7507 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2464145 Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7507.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-7507), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.