CVE-2026-63002 REDAXO: Stored XSS in Mediapool Sync Page via Unescaped Filesystem Filenames
An attacker can execute arbitrary scripts in a backend user's browser by placing malicious filenames in the media directory, leading to session theft.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-63002?
CVE-2026-63002 is a medium-severity cross-site scripting vulnerability in redaxo core, published on 23 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
REDAXO is a PHP-based content management system. Prior to 5.21.2, redaxo/src/addons/mediapool/pages/sync.php inserts filenames held in $diffFiles from the media filesystem into the Mediapool Sync page without rex_escape(). An attacker who can place an unregistered file with HTML metacharacters in the media directory can execute script in the browser of a backend user with media[sync] permission when that user opens the Sync page, enabling session theft or unauthorized backend actions. This issue is fixed in version 5.21.2.
Weakness: CWE-79
Which versions are affected by CVE-2026-63002?
2 open source packages ship an affected version, including redaxo/source. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
redaxo/source Packagist | All versions | 5.21.2 |
redaxo/source Packagist | All versions | 5.21.2 |
Products include Redaxo Redaxo.
How do I fix CVE-2026-63002?
Upgrade redaxo/source to 5.21.2 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-63002 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63002 exists.
Other vulnerabilities in redaxo core
- CVE-2018-18200 SQL injection in n/a
- CVE-2018-17831 SQL injection in n/a
- CVE-2026-21857 Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read
- CVE-2006-2843 Code injection in n/a
- CVE-2006-2844 Multiple PHP remote file inclusion vulnerabilities in Redaxo 3.0 allow remote attackers to execute arbitrary PHP code via a URL in the REX[I
Sources
Also known as GHSA-w998-qmw9-mf4m.