What is CVE-2026-77615?

CVE-2026-77615 is a high-severity vulnerability in Opencast, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-09-17.

How severe is CVE-2026-77615?

High severity. CVSS v3 base score is 8.7 out of 10.

XSS in Opencast

CVE-2026-77615

Paella Player is a set of libraries to create a multi stream video player. Prior to Paella Player 2.12.11 (as used in Opencast prior to 19.7 and 20.2), there is a potential XSS attack though closed captions cue text. This vulnerability is fixed in 2.12.11.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-09-17 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.6th percentile), scored 2026-11-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Opencast — versions < 19.7, >= 20.0, < 20.2
Polimediaupv Paella-Player — versions < 2.12.11

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-77615?: CVE-2026-77615 is a high-severity vulnerability in Opencast, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-09-17.
How severe is CVE-2026-77615?: High severity. CVSS v3 base score is 8.7 out of 10.