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CVE-2026-39878— Chamilo stored XSS via user registration leads to admin account takeover

Quick assessment

Affected
chamilo chamilo-lms
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Chamilo是Chamilo组织开源的一个学习管理系统。 Chamilo 1.11.38及之前版本存在跨站脚本漏洞，该漏洞源于用户注册表单存在存储型跨站脚本，可能导致未经身份验证的攻击者在管理员浏览器会话中执行任意JavaScript，导致完全平台管理员账户接管。

CVSS 9.3 · Critical EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1566.001 · Spearphishing Attachment

Affected Version Matrix 1

VendorProduct Version RangeStatus
chamilo chamilo-lms <= 1.11.38 affected
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I. Basic Information for CVE-2026-39878

Vulnerability Information
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Vulnerability Title
Chamilo stored XSS via user registration leads to admin account takeover
Source: CVE Program / CVE List V5
Vulnerability Description
Chamilo LMS versions 1.11.38 and earlier contain a stored cross-site scripting vulnerability in the user registration form that allows any unauthenticated attacker to execute arbitrary JavaScript in an administrator's browser session, leading to full platform admin account takeover. This has been patched in 1.11.40.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A: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 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Chamilo是Chamilo组织开源的一个学习管理系统。 Chamilo 1.11.38及之前版本存在跨站脚本漏洞，该漏洞源于用户注册表单存在存储型跨站脚本，可能导致未经身份验证的攻击者在管理员浏览器会话中执行任意JavaScript，导致完全平台管理员账户接管。
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 <= 1.11.38 -

II. Public POCs for CVE-2026-39878

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6435 chars
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III. Intelligence Information for CVE-2026-39878

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Vendor Advisories for CVE-2026-39878 (1)

News Coverage for CVE-2026-39878 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-39878

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