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CVE-2025-34032: Moodle LMS Jmol Plugin Cross-site Scripting (XSS)

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-06-24 · updated 2026-06-17
• Weakness: CWE-79

Description

A reflected cross-site scripting (XSS) vulnerability exists in the Moodle LMS Jmol plugin version 6.1 and prior via the data parameter in jsmol.php. The application fails to properly sanitize user input before embedding it into the HTTP response, allowing an attacker to execute arbitrary JavaScript in the victim's browser by crafting a malicious link. This can be used to hijack user sessions or manipulate page content. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-02 UTC.

Affected products

• Moodle Jmol Plugin: through 6.1

References

• https://vulncheck.com/advisories/moodle-lms-jmol-plugin-xss
• https://www.dionach.com/moodle-jmol-plugin-multiple-vulnerabilities/
• https://www.exploit-db.com/exploits/46881
• https://www.exploit-db.com/exploits/46881

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