CVE-2026-63765

HIGH8.8

Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation

Published Jul 23, 2026

Modified 1 months ago

Details

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.

References

FIX

https://github.com/chatwoot/chatwoot/commit/8dd0d08322edafaec24624b72ed2f6045921cb7b

DETECTION

https://github.com/chatwoot/chatwoot/issues/15072

FIX

https://github.com/chatwoot/chatwoot/pull/15039

FIX

https://github.com/chatwoot/chatwoot/releases/tag/v4.16.0

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-63765

ADVISORY