Sulu up to 2.6.24/3.0.7 Media Stream Controller MediaStreamController.php inline cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in Sulu up to 2.6.24/3.0.7. This vulnerability affects unknown code of the file src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php of the component Media Stream Controller. The manipulation of the argument inline results in cross site scripting. This vulnerability was named CVE-2026-82396. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Sulu up to 2.6.24/3.0.7. Affected is an unknown function of the file src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php of the component Media Stream Controller. The manipulation of the argument inline with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-82396 since 08/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:src/Sulu/Bundle/MediaBundle/Controller/MediaStreamController.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.6.25 or 3.0.8 eliminates this vulnerability.

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Productinfo

Name

• Sulu

Version

• 2.6.0
• 2.6.1
• 2.6.2
• 2.6.3
• 2.6.4
• 2.6.5
• 2.6.6
• 2.6.7
• 2.6.8
• 2.6.9
• 2.6.10
• 2.6.11
• 2.6.12
• 2.6.13
• 2.6.14
• 2.6.15
• 2.6.16
• 2.6.17
• 2.6.18
• 2.6.19
• 2.6.20
• 2.6.21
• 2.6.22
• 2.6.23
• 2.6.24
• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7

Website

• Product: https://github.com/sulu/sulu/

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