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

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-15 · updated 2026-06-17
Weakness: CWE-384

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.

Affected products

chatwoot/chatwoot: before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: chatwoot/chatwoot 2.4.0. Check the vendor advisory for mitigations.

References

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

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