CVE-2025-61788: Opencast Paella Player 7 vulnerable to Cross-Site-Scripting
Opencast is a free, open-source platform to support the management of educational audio and video content. Prior to Opencast 17.8 and 18.2, the paella would include and render some user inputs (metadata like title, description, etc.) unfiltered and unmodified. The vulnerability allows attackers to inject and malicious HTML and JavaScript in the player, which would then be executed in the browsers of users watching the prepared media. This can then be used to modify the site or to execute actions in the name of logged-in users. To inject malicious metadata, an attacker needs write access to the system. For example, the ability to upload media and modify metadata. This cannot be exploited by unauthenticated users. This issue is fixed in Opencast 17.8 and 18.2.
Other sources
Prior to Opencast 17.8 and 18.2 the paella would include and render some user inputs (metadata like title, description, etc.) unfiltered and unmodified.
Impact
The vulnerability allows attackers to inject and malicious HTML and JavaScript in the player, which would then be executed in the browsers of users watching the prepared media. This can then be used to modify the site or to execute actions in the name of logged-in users.
To inject malicious metadata, an attacker needs write access to the system. For example, the ability to upload media and modify metadata. This cannot be exploited by unauthenticated users.
Patches
This issue is fixed in Opencast 17.8 and 18.2, however they are not published to the Maven registry.
Resources
- Patch fixing the issue
For more information
If you have any questions or comments about this advisory: Open an issue in our issue tracker Email us at security@opencast.org
— GitHub
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-61788?
CVE-2025-61788 is considered a high severity vulnerability due to the potential for cross-site scripting (XSS) attacks.
How do I fix CVE-2025-61788?
To fix CVE-2025-61788, upgrade to Opencast versions 17.8 or 18.2 or later.
What software is affected by CVE-2025-61788?
CVE-2025-61788 affects the Opencast Paella Player versions prior to 17.8 and 18.2.
What kind of vulnerability is CVE-2025-61788?
CVE-2025-61788 is a cross-site scripting (XSS) vulnerability stemming from unfiltered user input.
When was CVE-2025-61788 disclosed?
CVE-2025-61788 was disclosed in 2025 as part of the security improvements for Opencast.