CVE-2026-63765

EUVD-2026-48360
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
8.2 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
chatwootchatwoot
𝑥
< 4.16.0
CNA
Common Weakness Enumeration
References
https://github.com/chatwoot/chatwoot/commit/8dd0d08322edafaec24624b72ed2f6045921cb7b
https://github.com/chatwoot/chatwoot/issues/15072
https://github.com/chatwoot/chatwoot/pull/15039
https://github.com/chatwoot/chatwoot/releases/tag/v4.16.0
https://www.vulncheck.com/advisories/chatwoot-unauthenticated-activestorage-direct-upload-arbitrary-blob-creation