Opencast's Paella Player 7 is vulnerable to Cross-Site Scripting

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source

EPSS

• CVE-2025-61788: 0.22% estimated exploitation activity in the next 30 days; percentile 12.25 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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

Published by the source

8 Oct 2025, 20:33 UTC

Last modified by the source

13 Oct 2025, 15:39 UTC

Source last checked

26 Oct 2026, 16:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-m2vg-rmq6-p62r

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# Patch Next advisory brief: CVE-2025-61788

Advisory: Opencast's Paella Player 7 is vulnerable to Cross-Site Scripting
IDs: CVE-2025-61788, GHSA-m2vg-rmq6-p62r
Record: https://patchnext.com/advisories/cve-2025-61788 (revision 1, source checked 26 Oct 2026, 16:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.opencastproject:opencast-common: affected <= 16.10

## Suggested inspection (read-only)
- Maven org.opencastproject:opencast-common: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.opencastproject:opencast-common.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-m2vg-rmq6-p62r (GitHub-reviewed advisory GHSA-m2vg-rmq6-p62r lists affected ranges: Maven org.opencastproject:opencast-common >=0 <=16.10)

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