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CVE-2026-113683— VPL for Moodle before 5.0.0 Reflected XSS via similarity/diff.php filename

Quick assessment

Affected
jcrodriguez-dis moodle-mod_vpl
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.

Moodle 的 VPL（虚拟编程实验室）插件在 5.0.0 版本之前存在一个反射型跨站脚本（XSS）漏洞。远程攻击者可通过在 文件中利用未编码的 或 参数注入恶意脚本。攻击者可构造包含 JavaScript 载荷的 链接，当拥有 权限的用户访问该链接时，脚本将在其浏览器中执行，从而以该用户的会话身份执行操作或窃取其数据。

CVSS 6.1 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-113683

Vulnerability Information
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Vulnerability Title
VPL for Moodle before 5.0.0 Reflected XSS via similarity/diff.php filename
Source: CVE Program / CVE List V5
Vulnerability Description
VPL (Virtual Programming Lab) for Moodle before 5.0.0 contains a reflected cross-site scripting vulnerability that allows remote attackers to inject script via unencoded filename1/filename2 parameters in similarity/diff.php. Attackers can craft a diff.php link with a JavaScript payload that runs when a user holding mod/vpl:similarity opens it, performing actions or disclosing data under their session.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
jcrodriguez-dis moodle-mod_vpl 0 ~ 5.0.0 -

II. Public POCs for CVE-2026-113683

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-113683

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Other References for CVE-2026-113683 (4)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-113683

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