# CVE-2026-117536: REDAXO CSRF token bypass in user administration

Source: https://junglewise.ai/threats/cve-2026-117536-redaxo-before-5-21-3-contains-a-cross-site-request-forgery  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-117536 · Severity: high · CVSS 8.8 · Published 2026-10-27

REDAXO is a web content management system used for building and managing websites. The backend user administration interface has a cross-site request forgery vulnerability that allows an attacker to trick a logged-in administrator into clicking a link to grant themselves admin rights, deactivate user accounts, or lock administrators out of the system. An attacker needs only to lure an authorized backend user to a malicious page while they are logged in.

Technologies: [REDAXO](https://junglewise.ai/threats/technologies/redaxo). Vendors: [REDAXO](https://junglewise.ai/threats/vendors/redaxo).

## Quick answers

**Is CVE-2026-117536 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-117536 being exploited in the wild.

**How severe is CVE-2026-117536?** High severity, with a CVSS score of 8.8, published 27 October 2026.

**Which products and versions are affected?** REDAXO before 5.21.3.

**Is there a fix for CVE-2026-117536?** Yes: fixed in 5.21.3. Until then: The token check has been modified to unconditionally require a valid CSRF token when FUNC_UPDATE or FUNC_APPLY parameters are present, regardless of the save parameter state. Upgrade to version 5.21.3 or later.</anigation>
<parameter name="timeline">[{"kind": "disclosed", "at": "2026-07-31"}, {"kind": "patched", "at": "2026-07-31", "note": "version 5.21.3"}, {"kind": "advisory", "at": "2026-10-27"}] Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-117536 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-117536?** Check whether you run REDAXO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 5.21.3

The token check has been modified to unconditionally require a valid CSRF token when FUNC_UPDATE or FUNC_APPLY parameters are present, regardless of the save parameter state. Upgrade to version 5.21.3 or later.</anigation>
<parameter name="timeline">[{"kind": "disclosed", "at": "2026-07-31"}, {"kind": "patched", "at": "2026-07-31", "note": "version 5.21.3"}, {"kind": "advisory", "at": "2026-10-27"}]

## Technical details

The CSRF token check in the user administration page (users/users) is guarded by a condition on the save parameter that the actual update path does not share. Requests carrying FUNC_UPDATE or FUNC_APPLY without the save parameter bypass the token validation entirely and reach the unprotected update code path. Since parameters are read via rex_request() (covering both GET and POST) with REDAXO's default SameSite=Lax session cookie, a plain GET request with embedded parameters is sufficient for exploitation.

## Affected products

- REDAXO REDAXO before 5.21.3

## References

- [https://github.com/redaxo/core/security/advisories/GHSA-mrrj-4f5x-j958](https://github.com/redaxo/core/security/advisories/GHSA-mrrj-4f5x-j958)
- [https://www.vulncheck.com/advisories/redaxo-before-5.21.3-csrf-token-bypass-via-users-users-privilege-escalation](https://www.vulncheck.com/advisories/redaxo-before-5.21.3-csrf-token-bypass-via-users-users-privilege-escalation)

## Related threats

- [REDAXO reflected XSS in metainfo API type parameter](https://junglewise.ai/threats/cve-2026-117537-redaxo-before-5-21-0-contains-a-reflected-cross-site-scripting)
- [REDAXO reflected cross-site scripting in media pool](https://junglewise.ai/threats/cve-2026-117535-redaxo-before-5-21-3-contains-a-reflected-cross-site-scripting)
- [REDAXO cross-site request forgery in article history plugin](https://junglewise.ai/threats/cve-2026-117534-redaxo-before-5-21-3-contains-a-cross-site-request-forgery)
- [REDAXO stored cross-site scripting in mediapool SVG uploads](https://junglewise.ai/threats/cve-2026-117533-redaxo-from-5-18-0-before-5-21-4-contains-a-stored-cross-site)
- [REDAXO stored cross-site scripting in media and link widgets](https://junglewise.ai/threats/cve-2026-116900-redaxo-before-5-21-4-contains-a-stored-cross-site-scripting)