Description
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.
References10
- github.com/opencast/opencast/commit/701682c635f668228c3e8fb7b45…
- github.com/opencast/opencast/pull/7736
- github.com/opencast/opencast/releases/tag/19.7
- github.com/opencast/opencast/releases/tag/20.2
- github.com/opencast/opencast/security/advisories/GHSA-m6c8-jcw2…
- github.com/polimediaupv/paella-core/commit/94a36490808ac5a1f60a…
- github.com/polimediaupv/paella-core/commit/9b2f14ec4cf55efaf4c0…
- github.com/polimediaupv/paella-player/blob/a1b6c42467938a00a4b4…
- github.com/polimediaupv/paella-player/commit/6fe4af7306044198c8…
- github.com/opencast/opencast/security/advisories/GHSA-m6c8-jcw2…
Metrics
- CVSS 3.1
-
8.7
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N - EPSS — exploit probability
- 1% percentile: 47 · as of 8 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.