CVE-2026-33715— Chamilo LMS has Unauthenticated SSRF and Open Email Relay via install.ajax.php test_mailer action
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I. Basic Information for CVE-2026-33715
Vulnerability Information
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Vulnerability Title
Chamilo LMS has Unauthenticated SSRF and Open Email Relay via install.ajax.php test_mailer action
Source: NVD (National Vulnerability Database)
Vulnerability Description
Chamilo LMS is an open-source learning management system. In version 2.0-RC.2, the file public/main/inc/ajax/install.ajax.php is accessible without authentication on fully installed instances because, unlike other AJAX endpoints, it does not include the global.inc.php file that performs authentication and installation-completed checks. Its test_mailer action accepts an arbitrary Symfony Mailer DSN string from POST data and uses it to connect to an attacker-specified SMTP server, enabling Server-Side Request Forgery (SSRF) into internal networks via the SMTP protocol. An unauthenticated attacker can also abuse this to weaponize the Chamilo server as an open email relay for phishing and spam campaigns, with emails appearing to originate from the server's IP address. Additionally, error responses from failed SMTP connections may disclose information about internal network topology and running services. This issue has been fixed in version 2.0.0-RC.3.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
Chamilo 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Chamilo是Chamilo开源的一个学习管理系统。 Chamilo 2.0-RC.2版本存在代码问题漏洞，该漏洞源于install.ajax.php文件无需身份验证即可访问，可能导致未经身份验证的攻击者利用SMTP协议进行服务端请求伪造或滥用服务器作为开放邮件中继。
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| chamilo | chamilo-lms | >= 2.0-RC.2, < 2.0-RC.3 | - |
II. Public POCs for CVE-2026-33715
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · chamilo · 2026-04-14 · 8 CVEs total
| CVE-2026-35196 | 8.8 HIGH | Chamilo LMS has OS Command Injection via export_all_certificates action |
| CVE-2026-40291 | 8.8 HIGH | Chamilo LMS has Privilege Escalation via API User Role Modification |
| CVE-2026-34160 | 8.6 HIGH | Chamilo LMS: Unauthenticated SSRF via PENS Plugin allows attacker to probe internal networ |
| CVE-2026-34602 | 7.1 HIGH | Chamilo LMS: IDOR in /api/course_rel_users Allows Unauthorized Enrollment of Arbitrary Use |
| CVE-2026-34370 | 6.5 MEDIUM | Chamilo LMS: IDOR in the Notebook Module allows an attacker to view other users' private n |
| CVE-2026-34161 | Chamilo LMS: Stored XSS via Malicious File Upload in Social Post Attachments Leads to Arbi | |
| CVE-2026-33714 | Chamilo LMS has Authenticated SQL Injection in statistics.ajax.php users_active action (2. |
IV. Related Vulnerabilities
Same product: chamilo-lms
- CVE-2026-40291
Chamilo LMS has Privilege Escalation via API User Role Modif - CVE-2026-35196
Chamilo LMS has OS Command Injection via export_all_certific - CVE-2026-34602
Chamilo LMS: IDOR in /api/course_rel_users Allows Unauthoriz - CVE-2026-34370
Chamilo LMS: IDOR in the Notebook Module allows an attacker - CVE-2026-34161
Chamilo LMS: Stored XSS via Malicious File Upload in Social
Same vendor: chamilo
- CVE-2026-40291
Chamilo LMS has Privilege Escalation via API User Role Modif - CVE-2026-35196
Chamilo LMS has OS Command Injection via export_all_certific - CVE-2026-34602
Chamilo LMS: IDOR in /api/course_rel_users Allows Unauthoriz - CVE-2026-34370
Chamilo LMS: IDOR in the Notebook Module allows an attacker - CVE-2026-34161
Chamilo LMS: Stored XSS via Malicious File Upload in Social
Same weakness: CWE-306
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WordPress Download From Files 1.48 Arbitrary File Upload - CVE-2021-47936
OpenCATS 0.9.4 Remote Code Execution via Resume Upload - CVE-2021-47933
WordPress MStore API 2.0.6 Arbitrary File Upload - CVE-2026-8185
UGREEN CM933 Administrative missing authentication - CVE-2026-42302
FastGPT: Unauthenticated Remote Code Execution (RCE) via cod
V. Comments for CVE-2026-33715
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