What’s Vulnerable › Vulnerabilities

CVE-2026-82396: Sulu: Stored XSS via media download inline-disposition override

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-31 · updated 2026-09-08
• Weakness: CWE-79

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 products

• sulu: before 2.6.25; from 3.0.0-alpha1, < 3.0.8

References

• https://github.com/sulu/sulu/commit/d061094f5b7bb1d5e974544fce30bede9c7adf8e
• https://github.com/sulu/sulu/releases/tag/2.6.25
• https://github.com/sulu/sulu/releases/tag/3.0.8
• https://github.com/sulu/sulu/security/advisories/GHSA-pp4x-ccxq-6r33

Get alerted when CVE-2026-82396 or the next vulnerability affects your stack