What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-23
• Weakness: CWE-79

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.

Affected products

• jcrodriguez-dis moodle-mod_vpl: before 5.0.0 — fixed in 5.0.0

How to fix

Upgrade to a fixed version: jcrodriguez-dis moodle-mod_vpl 5.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/jcrodriguez-dis/moodle-mod_vpl/blob/V4.5.0/similarity/diff.class.php#L412-L419
• https://github.com/jcrodriguez-dis/moodle-mod_vpl/commit/5dd7fe00df2816b692f8ea262c6fa8cdee0b26b7
• https://github.com/jcrodriguez-dis/moodle-mod_vpl/releases/tag/V5.0.0
• https://www.vulncheck.com/advisories/vpl-for-moodle-before-5.0.0-reflected-xss-via-similarity-diff-php-filename

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