XSS in Jcrodriguez-Dis Moodle-Mod Vpl
CVE-2026-113683
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/jcrodriguez-dis/moodle-mod_vpl/commit/5dd7fe00df2816b692f8ea262c6fa8… (patch)
- github.com/jcrodriguez-dis/moodle-mod_vpl/releases/tag/V5.0.0 (release-notes)
- github.com/jcrodriguez-dis/moodle-mod_vpl/blob/V4.5.0/similarity/diff.class.php (technical-description)
- www.vulncheck.com/advisories/vpl-for-moodle-before-5.0.0-reflected-xss-via-simi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-113683?
- CVE-2026-113683 is a medium-severity vulnerability in Jcrodriguez-Dis Moodle-Mod Vpl, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-20.
- How severe is CVE-2026-113683?
- Medium severity. CVSS v3 base score is 6.1 out of 10.