CVE-2026-63765
Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation
- State
- Published
- Severity
- 8.8 High
- Published
- Jul 23, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jul 18, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | VulnCheck |
| 3.1 | 8.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
chatwootchatwoot |
|
References
- Researcher Disclosuretechnical-descriptionexploitissue-tracking
- Chatwoot 4.16.0 Release Notesrelease-notespatch
- Pull Requestissue-trackingpatch
- Patch Commitpatch
- https://www.vulncheck.com/advisories/chatwoot-unauthenticated-activestorage-direct-upload-arbitrary-blob-creationthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.