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CVE-2026-63765

Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation

CVSS 4.0 8.8 HIGHCVSS 3.1 8.2 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-63765

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-63765

Published

chatwoot

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "chatwoot",
                    "product": "chatwoot",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/chatwoot/chatwoot",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "4.16.0"
                        }
                    ],
                    "repo": "https://github.com/chatwoot/chatwoot"
                }

Original source record · Cite this exact observation · Complete original publisher JSON