High severity · published Jul 23, 2026
CVE-2026-63765
Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation
8.2
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CH
chatwoot · chatwoot
before 4.16.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63765
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63765
github.com
https://github.com/chatwoot/chatwoot/commit/8dd0d08322edafaec24624b72ed2f6045921cb7b
github.com
https://github.com/chatwoot/chatwoot/issues/15072
github.com
https://github.com/chatwoot/chatwoot/pull/15039
github.com
https://github.com/chatwoot/chatwoot/releases/tag/v4.16.0
www.vulncheck.com
https://www.vulncheck.com/advisories/chatwoot-unauthenticated-activestorage-direct-upload-arbitrary-blob-creation
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