Opencast up to 17.7/18.1 cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in Opencast up to 17.7/18.1. The affected element is an unknown function. Executing a manipulation can lead to cross site scripting. This vulnerability is tracked as CVE-2025-61788. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Opencast up to 17.7/18.1. It has been declared as problematic. This vulnerability affects an unknown part. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-61788 since 09/30/2025. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 17.8 or 18.2 eliminates this vulnerability. Applying the patch 2809520fa88d108d8104c760f00c10bad42c14f9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Opencast

Version

• 17.0
• 17.1
• 17.2
• 17.3
• 17.4
• 17.5
• 17.6
• 17.7
• 18.0
• 18.1

License

• open-source

Website

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

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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