Auth bypass in Chatwoot
CVE-2026-63765
Chatwoot before 4.16.0 contains an authentication bypass vulnerability in the direct uploads controller that allows unauthenticated attackers to create arbitrary ActiveStorage blobs in any tenant account. Attackers can exploit missing authentication checks to resolve any account and conversation, then obtain signed PUT URLs to write arbitrary data to the application's storage backend.
Vulnerability class: Broken Authentication
EPSS: 0.007 (51.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L.
Affected products
- Chatwoot — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking, technical-description, exploit)
- disclosure@vulncheck.com (release-notes, patch)
- disclosure@vulncheck.com (issue-tracking, patch)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-63765?
- CVE-2026-63765 is a high-severity vulnerability in Chatwoot, classified under Missing Authentication for Critical Function. CVSS score: 8.2/10. Published 2026-07-23.
- How severe is CVE-2026-63765?
- High severity. CVSS v3 base score is 8.2 out of 10.