Vulnerability · Published Sep 17, 2026 · Assigned by GitHub_M
CVE-2026-77615Paella Player: Stored XSS via caption cue text
High 8.7
In plain English
A high-severity cross-site scripting in opencast from opencast. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.7High
Exploit odds (30 days)0.6%top 53.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.opencastproject:opencast-engage-paella-player-7 | 19.7 | GHSA-m6c8-jcw2-5r25 |
| Maven | org.opencastproject:opencast-engage-paella-player-7 | 20.2 | GHSA-m6c8-jcw2-5r25 |
| npm | paella-core | 1.50.6 | GHSA-m6c8-jcw2-5r25 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| opencast | opencast | < 19.7>= 20.0, < 20.2 |
| polimediaupv | paella-player | < 2.12.11 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
References
- https://github.com/opencast/opencast/security/advisories/GHSA-m6c8-jcw2-5r25 x_refsource_CONFIRM
- https://github.com/opencast/opencast/pull/7736 x_refsource_MISC
- https://github.com/opencast/opencast/commit/701682c635f668228c3e8fb7b4564b3294788e40 x_refsource_MISC
- https://github.com/polimediaupv/paella-core/commit/94a36490808ac5a1f60a0745d71ec9253f6d206b x_refsource_MISC
- https://github.com/polimediaupv/paella-core/commit/9b2f14ec4cf55efaf4c045c77a5ed8f5ec559ab4 x_refsource_MISC
- https://github.com/polimediaupv/paella-player/commit/6fe4af7306044198c8e91e2e7f4128428b83cf03 x_refsource_MISC
- https://github.com/opencast/opencast/releases/tag/19.7 x_refsource_MISC
- https://github.com/opencast/opencast/releases/tag/20.2 x_refsource_MISC
- https://github.com/polimediaupv/paella-player/blob/a1b6c42467938a00a4b4d0b8c68435cd4f9d2a16/repos/paella-core/CHANGELOG.md?plain=1#L21 x_refsource_MISC