Vulnerability · Published Aug 31, 2026 · Assigned by GitHub_M
CVE-2026-82396Sulu: Stored XSS via media download inline-disposition override
Medium 5.4
In plain English
A medium-severity cross-site scripting in sulu from sulu. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Sulu is an open-source PHP content management system based on the Symfony framework. Prior to versions 2.6.25 and 3.0.8, src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php allows the /media/{id}/download/{slug} route and its administration variant to honor the inline query parameter for scriptable MIME types. The vulnerable stored Content-Type values include text/html, application/xhtml+xml, text/xml, and application/xml. An attacker with media upload permission can store an HTML, XHTML, or XML document and create a link using inline=1, causing the application to return the file on the Sulu origin instead of forcing Content-Disposition attachment. When an authenticated victim opens the link, attacker-controlled JavaScript can execute with the victim's Sulu-origin session and can read data or perform actions as that victim. This issue is fixed in versions 2.6.25 and 3.0.8.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | sulu/sulu | 2.6.25 | GHSA-pp4x-ccxq-6r33 |
| Packagist | sulu/sulu | 3.0.8 | GHSA-pp4x-ccxq-6r33 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/sulu/sulu/security/advisories/GHSA-pp4x-ccxq-6r33 x_refsource_CONFIRM
- https://github.com/sulu/sulu/commit/d061094f5b7bb1d5e974544fce30bede9c7adf8e x_refsource_MISC
- https://github.com/sulu/sulu/releases/tag/2.6.25 x_refsource_MISC
- https://github.com/sulu/sulu/releases/tag/3.0.8 x_refsource_MISC