REDAXO before 5.21.3 CSRF Token Bypass via users/users Privilege Escalation

Advisories

REDAXO before 5.21.3 CSRF Token Bypass via users/users Privilege Escalation

Severity: high
Date: 10/27/2026
Affecting: core >= 0, < 5.21.3
CVE: CVE-2026-117536
CWE: CWE-352 Cross-Site Request Forgery (CSRF)
CVSS: 8.6
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: GitHub Security Advisory (GHSA-mrrj-4f5x-j958)
VulnCheck Advisory: REDAXO before 5.21.3 CSRF Token Bypass via users/users Privilege Escalation
Credit: V-C-Williams
Description: REDAXO before 5.21.3 contains a cross-site request forgery vulnerability in the backend user administration page (users/users) because the CSRF token check only runs when the save parameter is set, while the update path triggered by FUNC_UPDATE does not require it. Attackers can lure a logged-in backend user with the users[] permission to a crafted GET link to grant administrator rights, deactivate accounts, or lock out the sole administrator.

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