Executive brief
SeaCMS, a popular open-source content management system for video and film websites, is vulnerable to a security flaw in its media player component. An attacker can trick a logged-in user into clicking a malicious link, allowing the attacker to run unauthorized scripts in the user's browser. This could lead to the theft of login sessions, unauthorized actions on the website, or the display of fraudulent content to users.
Technical details
A reflected cross-site scripting (XSS) vulnerability exists in SeaCMS versions prior to 13.2. The flaw is located in the 'vid' parameter within the '/Upload/js/player/dmplayer/player' route. The application fails to properly sanitize this parameter before including it in the web page generation, allowing an attacker to break out of the existing JavaScript context using closing tags (e.g., " > } </script>). An attacker can exploit this by crafting a malicious URL and social engineering an authenticated user into visiting it. Successful exploitation allows for the execution of arbitrary JavaScript, which can be used for session hijacking or defacement. A fix is available in version 13.2 and later.
Affected products
- SeaCMS SeaCMS (海洋CMS) < 13.2
Timeline
- 2025-08-04: disclosed: Vulnerability details shared on GitHub issue tracker
- 2025-08-05: advisory: CVE-2025-50592 published
- 2026-04-23: patched: Vendor released version 13.5 (vulnerability fixed in 13.2)