CVE-2026-63001 REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`
An administrator can inject malicious HTML into Media Manager type names, leading to stored XSS and potential session theft when other administrators interact with the media.
- 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-2026-63001?
CVE-2026-63001 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, the mediaIsInUse() handler in redaxo/src/addons/media_manager/lib/media_manager.php inserts a Media Manager type name into raw backend warning HTML without escaping it when invoked through MEDIA_IS_IN_USE. An administrator with Media Manager access can store HTML in a type name, and the payload executes in another administrator's browser when that administrator tries to delete media referenced by the type's effects, 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-2026-63001?
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-2026-63001?
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-2026-63001 being exploited?
There is no known exploitation of CVE-2026-63001 in the wild and no public exploit code.
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-mf2p-wjp4-99pq.