What’s Vulnerable › Vulnerabilities

CVE-2026-63765: Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-23 · updated 2026-09-17
• Weakness: CWE-306

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.

Affected products

• chatwoot/chatwoot: before 4.16.0 — fixed in 4.16.0

How to fix

Upgrade to a fixed version: chatwoot/chatwoot 4.16.0. Check the vendor advisory for mitigations.

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

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