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CVE-2026-34161— Chamilo LMS: Stored XSS via Malicious File Upload in Social Post Attachments Leads to Arbitrary JavaScript Execution

Quick assessment

Affected
chamilo chamilo-lms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Chamilo LMS是Chamilo开源的一套开源的在线学习和协作系统。该系统支持创建教学内容、远程培训和在线答题等。 Chamilo LMS 2.0.0-RC.3之前版本存在跨站脚本漏洞，该漏洞源于社交帖子附件上传功能存在存储型跨站脚本漏洞，可能导致会话劫持、账户接管和权限提升。

AI Predicted 6.1 Difficulty: Easy EPSS 0.30% · P21
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I. Basic Information for CVE-2026-34161

Vulnerability Information
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Vulnerability Title
Chamilo LMS: Stored XSS via Malicious File Upload in Social Post Attachments Leads to Arbitrary JavaScript Execution
Source: CVE Program / CVE List V5
Vulnerability Description
Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, a Stored Cross-Site Scripting (XSS) vulnerability exists in the social post attachment upload functionality, where an authenticated user can upload a malicious HTML file containing JavaScript via the /api/social_post_attachments endpoint. The uploaded file is served back from the application at the generated contentUrl without sanitization, content type restrictions, or a Content-Disposition: attachment header, causing the JavaScript to execute in the browser within the application's origin. Because the payload is stored server-side and runs in the trusted origin, an attacker can perform session hijacking, account takeover, privilege escalation (if an admin views the link), and arbitrary actions on behalf of the victim. This issue has been fixed in version 2.0.0-RC.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Chamilo LMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Chamilo LMS是Chamilo开源的一套开源的在线学习和协作系统。该系统支持创建教学内容、远程培训和在线答题等。 Chamilo LMS 2.0.0-RC.3之前版本存在跨站脚本漏洞，该漏洞源于社交帖子附件上传功能存在存储型跨站脚本漏洞，可能导致会话劫持、账户接管和权限提升。
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 < 2.0.0-RC.3 -

II. Public POCs for CVE-2026-34161

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III. Intelligence Information for CVE-2026-34161

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Patches & Fixes for CVE-2026-34161 (2)

Vendor Advisories for CVE-2026-34161 (1)

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-2026-33715 7.2 HIGH Chamilo LMS has Unauthenticated SSRF and Open Email Relay via install.ajax.php test_mailer
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-2026-33714 Chamilo LMS has Authenticated SQL Injection in statistics.ajax.php users_active action (2.

IV. Related Vulnerabilities

Same product: chamilo-lms
Same vendor: chamilo
Same weakness: CWE-79

V. Comments for CVE-2026-34161

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