---
id: CVE-2026-117535
title: REDAXO before 5.21.3 Reflected XSS via opener_link in Media Pool
summary: >-
  REDAXO before 5.21.3 contains a reflected cross-site scripting vulnerability
  in the backend media pool detail page, where the opener_link parameter is
  rendered without HTML escaping. Unauthenticated attackers can lure logged-in
  backend u…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: redaxo
product: core
affected:
  - core < 5.21.3
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T10:59:30.773Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117535'
references:
  - url: 'https://github.com/redaxo/core/security/advisories/GHSA-5293-gg47-5xmh'
    label: GitHub Security Advisory (GHSA-5293-gg47-5xmh)
  - url: >-
      https://www.vulncheck.com/advisories/redaxo-before-5.21.3-reflected-xss-via-opener-link-in-media-pool
    label: >-
      VulnCheck Advisory: REDAXO before 5.21.3 Reflected XSS via opener_link in
      Media Pool
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.297Z'
---

## Overview

REDAXO before 5.21.3 contains a reflected cross-site scripting vulnerability in the backend media pool detail page, where the opener_link parameter is rendered without HTML escaping. Unauthenticated attackers can lure logged-in backend users with media permissions into clicking a crafted link. The injected script can then read the CSRF token and perform actions with the victim's permissions, including code execution via template or module edits when the victim is an administrator.

## Affected

- `core < 5.21.3`

## Remediation

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