CVE-2026-63765
Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation
HIGH 8.8EPSS 0.7%
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.
- Affected
- chatwoot
- CVSS v4.0 VULNCHECK
- 8.8 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 VULNCHECK
- 8.2 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L - EPSS
- 0.70% chance of exploitation in the next 30 days, 52nd percentile
- Published
- 2026-07-23
- Updated
- 2026-09-17
Proof-of-concept exploits (1)
- chatwoot/chatwoot/issues/1507237745★ · 2026-10-13