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High · 8.2 Public exploit CVE-2026-63765 EUVD-2026-48360GHSA-9wjj-m9cm-hjjc

Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation

Published Jul 23, 2026 · Updated Sep 17, 2026 · Assigned by VulnCheck

Vendor: chatwoot Product: chatwoot

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

VendorProductAffectedFixed
chatwoot chatwoot < 4.16.0 4.16.0

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • n3chik/CVE-2026-63765 ★ 1 · Nov 1, 2026

    PoC exploit for CVE-2026-63765 — Chatwoot < 4.16.0 unauthenticated arbitrary file write via ActiveStorage Direct Upload

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References