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Vulnerability record · CVE-2026-63765 · published 23 July 2026

CVE-2026-63765: Missing authentication for critical function vulnerability

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.

8.8 CVSS 4.0 High EPSS 0.70% · top 48.6% CWE-306 · Missing authentication for critical function Deferred
8.8CVSS 4.0 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-63765), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.