CVE-2026-63765

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 v4.0

8.8 HIGHCVSS: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:X/V:X/RE:X/U:X

CVSS v3.1

8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

EPSS

0.70% chance of exploitation in the next 30 days, 51th percentile

Published

2026-07-23

Updated

2026-07-27

Proof-of-concept exploits (1)

• chatwoot/chatwoot/issues/15072

References

• CVE Record
• NVD entry

Related

• CVE-2026-63764
• CVE-2026-63766
• CVE-2026-63731
• CVE-2026-63767
• CVE-2026-63730
• CVE-2026-63768