Medium
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3740
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:50 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-3740
Complete source record
{
"id": "61ed7cff89162ea24b0d1449849ebcfb32bb463fc97ebc9e1d615bc615d510d8",
"url": "https://osv.dev/vulnerability/CVE-2021-3740",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3740",
"summary": "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.",
"evidence": "osv:CVE-2021-3740",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-3740",
"aliases": [
"CVE-2021-3740"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/chatwoot/chatwoot",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "480eb3043c9ee79d6e8e6eacf981f49cfe00f6ed"
},
{
"fixed": "6fdd4a29969be8423f31890b807d27d13627c50c"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:chatwoot:chatwoot:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.4.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "6fdd4a29969be8423f31890b807d27d13627c50c"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2.3.2",
"v2.3.1",
"v2.3.0",
"v2.2.1",
"v2.2.0",
"v2.1.1",
"v2.1.0",
"v2.0.2",
"v2.0.1",
"v2.0.0",
"v1.22.1",
"v1.22.0",
"v1.21.1",
"v1.21.0",
"v1.20.0",
"v1.19.0",
"v1.18.1",
"v1.18.0",
"v1.17.1",
"v1.17.0",
"v1.16.2",
"v1.16.1",
"v1.15.1",
"v1.15.0",
"v1.14.3",
"v1.14.2",
"v1.14.1",
"v1.14.0",
"v1.13.1",
"v1.13.0",
"v1.12.2",
"v1.12.1",
"v1.12.0",
"v1.11.1",
"v1.11.0",
"v1.10.0",
"v1.9.0",
"v1.8.0",
"v1.7.2",
"v1.7.1",
"v1.7.0",
"v1.6.3",
"v1.6.2",
"v1.6.1",
"v1.6.0",
"v1.5.3",
"v1.5.2",
"v1.5.1",
"v1.5.0",
"v1.4.2",
"1.4.2",
"v1.4.1",
"v1.4.0",
"v1.3.0",
"v1.2.4",
"1.2.4",
"v1.2.3",
"v1.2.2",
"v1.2.1",
"v1.2.0",
"v1.1.3",
"v1.1.2",
"v1.1.1",
"v1.1.0",
"v1.0.3",
"v1.0.2",
"v1.0.1",
"v1.0.0",
"v0.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3740.json"
}
}
],
"modified": "2026-10-20T10:54:49.122778602Z",
"provider": "osv",
"references": [
"https://huntr.com/bounties/1625470476437-chatwoot/chatwoot",
"https://github.com/chatwoot/chatwoot/commit/6fdd4a29969be8423f31890b807d27d13627c50c"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-3740",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 386200,
"published_at": "2024-11-15T11:15:04.987+00:00"
}