CVE-2026-63765
Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation
CVSS Score
8.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-306 |
| Vendor | chatwoot |
| Product | chatwoot |
| Published | Jul 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low
Affected Versions
chatwoot / chatwoot
0 < 4.16.0
References
github.com: https://github.com/chatwoot/chatwoot/issues/15072 github.com: https://github.com/chatwoot/chatwoot/releases/tag/v4.16.0 github.com: https://github.com/chatwoot/chatwoot/pull/15039 github.com: https://github.com/chatwoot/chatwoot/commit/8dd0d08322edafaec24624b72ed2f6045921cb7b vulncheck.com: https://www.vulncheck.com/advisories/chatwoot-unauthenticated-activestorage-direct-upload-arbitrary-blob-creation
Credits
George Chen