CVE-2026-63765— Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation
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I. Basic Information for CVE-2026-63765
Vulnerability Information
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Vulnerability Title
Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Chatwoot 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Chatwoot是Chatwoot组织开源的一个应用软件。客户参与套件,对讲、Zendesk、Salesforce 服务云等的开源替代方案。 Chatwoot 4.16.0之前版本存在授权问题漏洞，该漏洞源于直接上传控制器存在身份验证绕过问题，允许未经身份验证的攻击者创建任意ActiveStorage blobs并获取签名PUT URL写入任意数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-63765
| # | POC Description | Source Link | Shenlong Link |
|---|
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III. Intelligence Information for CVE-2026-63765
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Patches & Fixes for CVE-2026-63765 (2)
Vendor Advisories for CVE-2026-63765 (1)
Proof of Concept for CVE-2026-63765 (1)
Vendor Pages for CVE-2026-63765 (1)
- 🔗 Release v4.16.0 · chatwoot/chatwoot · GitHubrelease-notes
IV. Related Vulnerabilities
Same product: chatwoot
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chatwoot Admin IframeLoader.vue cross site scripting
Same vendor: chatwoot
- CVE-2026-44707
Chatwoot: Pre-Account Takeover via OAuth on Unconfirmed Acco - CVE-2026-44706
Chatwoot: SQL Injection in Conversation/Contact Filter API v - CVE-2024-0640
Stored XSS in chatwoot/chatwoot - CVE-2025-21628
Chatwoot has a Blind SQL-injection in Conversation and Conta - CVE-2021-3740
Session Fixation in chatwoot/chatwoot
Same weakness: CWE-306
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V. Comments for CVE-2026-63765
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