---
id: CVE-2026-117536
title: REDAXO before 5.21.3 CSRF Token Bypass via users/users Privilege Escalation
summary: >-
  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…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-352
vendor: redaxo
product: core
affected:
  - core < 5.21.3
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T10:59:31.445Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117536'
references:
  - url: 'https://github.com/redaxo/core/security/advisories/GHSA-mrrj-4f5x-j958'
    label: GitHub Security Advisory (GHSA-mrrj-4f5x-j958)
  - url: >-
      https://www.vulncheck.com/advisories/redaxo-before-5.21.3-csrf-token-bypass-via-users-users-privilege-escalation
    label: >-
      VulnCheck Advisory: REDAXO before 5.21.3 CSRF Token Bypass via users/users
      Privilege Escalation
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.297Z'
---

## Overview

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.

## Affected

- `core < 5.21.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.