CVE-2025-61788
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In Opencast prior to versions 17.8 and 18.2, the paella player renders user-supplied metadata (title, description, etc.) without filtering. This allows an attacker to inject malicious HTML and JavaScript that executes in the browsers of users viewing the media.
Risk Assessment
An attacker with write access can perform actions on behalf of logged-in users or modify the site. The flaw cannot be exploited by unauthenticated users but requires write privileges.
Recommendation
Update Opencast to version 17.8 or 18.2. Restrict write and metadata modification privileges to trusted users.
Other vulnerabilities in Opencast
See all- CVE-2026-77614High
Opencast is a free, open-source platform to support the management of educational audio and video content. Prior to versions 19.7 and 20.2, the default security configuration in etc/security/mh_default_org.xml accepts a client-selected JSESSIONID from the ;jsessionid= URL path parameter and does not replace it when the victim logs in. An unauthenticated attacker can send a crafted link to a victim whose browser has no active Opencast session cookie, wait for the victim to authenticate, and then reuse the known identifier as the victim's authenticated session. This can expose the victim's data and actions and can produce full administrative account takeover when the victim is an administrator. This issue is fixed in versions 19.7 and 20.2.
- CVE-2025-61906Medium
Prior to Opencast 17.8 and 18.2, in some situations Opencast's editor may publish a video without notifying the user. This may lead to users accidentally publishing media not meant for publishing, possibly exposing internal media. The risk of actual impact is very low and requires a user with write access to an event using the editor and first clicking 'Save & Publish' before selecting 'Save'.
- CVE-2025-55202Medium
Opencast version 18.0 and versions before 17.7 have insufficient protections against path traversal attacks in the UI config module. The path is checked without checking for the file separator, potentially allowing access to files in another folder starting with the same path. This is fixed in versions 17.7 and 18.1.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS