CVE-2025-61788Network attack vector

Stored XSS via unescaped player metadata

Published Oct 8, 2025 · Updated Oct 8, 2025

Stored cross-site scripting in Opencast before 17.8 and 18.0 through 18.1 allows remote authenticated users to run script in viewers' browsers. Paella Player 7 plugins interpolate title, description, presenter, contributor, and other media metadata into HTML templates instead of assigning it as text. An attacker needs media-upload and metadata-write access, and a viewer must open the prepared media; the script can alter the page or act with the viewer's session.

CVSS severity5.1
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Opencast before 17.8 and 18.0 through 18.1 allows remote authenticated users to run script in viewers' browsers. Paella Player 7 plugins interpolate title, description, presenter, contributor, and other media metadata into HTML templates instead of assigning it as text. An attacker needs media-upload and metadata-write access, and a viewer must open the prepared media; the script can alter the page or act with the viewer's session.

The record

CVE
CVE-2025-61788
Published
Oct 8, 2025
Updated
Oct 8, 2025
Vendor
Opencast
Product
Opencast
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 17.8
  2. Affected versionversion=>= 18.0, < 18.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Opencast · Opencastversion=< 17.8; version=>= 18.0, < 18.2

Published CVSS scores

5.1GitHub, Inc.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
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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