Opencast's Paella Player 7 is vulnerable to Cross-Site Scripting
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
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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.opencastproject:opencast-common | <= 16.10 | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Java / Kotlin (Maven)
- Package
org.opencastproject:opencast-common- Disclosed
- 08.10.2025
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-m2vg-rmq6-p62r - CC BY 4.0
Vulnerability history: org.opencastproject:opencast-common
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 12.2021 10.2025
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
- Medium 3
Disclosures per year
- 2021: 3
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 2
- 2026: 0
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Opencast's Paella Player 7 is vulnerable to Cross-Site Scripting this entry
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