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
Published · last modified .
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.
EPSS exploit prediction
EPSS 0.005, 41.8th percentile (scored ); unchanged over 30 days. About EPSS.
Affected products
- Chatwoot — versions 0
Weakness classification (CWE)
Public exploits and proof-of-concept code
1 public repository with exploit or proof-of-concept code for this CVE:
- n3chik/CVE-2026-63765 (1 star, last pushed 2026-11-01): PoC exploit for CVE-2026-63765 — Chatwoot < 4.16.0 unauthenticated arbitrary file write via ActiveStorage Direct Upload
References
- Researcher Disclosure (issue-tracking, technical-description, exploit)
- Chatwoot 4.16.0 Release Notes (release-notes, patch)
- Pull Request (issue-tracking, patch)
- Patch Commit (patch)
- www.vulncheck.com/advisories/chatwoot-unauthenticated-activestorage-direct-uplo… (third-party-advisory)
This CVE has public exploit evidence. See the latest CVEs with public exploits.