What is the CVSS score of CVE-2025-67850?

CVE-2025-67850 has a CVSS 3.1 base score of 7.3 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Moodle are affected by CVE-2025-67850?

A Cross-Site Scripting (XSS) vulnerability in Moodle's formula editor allows attackers to inject malicious scripts that could compromise user accounts and steal sensitive educational data.. A patch is available.

How to fix or mitigate CVE-2025-67850?

Within 24 hours: Disable the formula editor feature in Moodle settings and notify administrators and instructors of the restriction. Within 7 days: Audit Moodle logs for suspicious formula editor activity and conduct a security awareness communication to users about not clicking untrusted links from Moodle. Within 30 days: Implement Web Application Firewall (WAF) rules to sanitize formula editor inputs, monitor vendor advisories for patch availability, and prepare a deployment plan for when the patch is released.

Moodle CVE-2025-67850

HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-02-03 patrick@puiterwijk.org

GHSA-6mmv-f6c6-v6q8

Moodle XSS

7.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.3 HIGH

AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Feb 03, 2026 - 11:15 nvd

HIGH 7.3

DescriptionCVE.org

A flaw was found in moodle. This vulnerability, known as Cross-Site Scripting (XSS), occurs due to insufficient checks on user-provided data in the formula editor's arithmetic expression fields. A remote attacker could inject malicious code into these fields. When other users view these expressions, the malicious code would execute in their web browsers, potentially compromising their data or leading to unauthorized actions.

AnalysisAI

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Moodle. A flaw was found in moodle. This vulnerability, known as Cross-Site Scripting (XSS), occurs due to insufficient checks on user-provided data in the formula editor's arithmetic expression fields. A remote attacker could inject malicious code into these fields. When other users view these expressions, the malicious code would execute in their web browsers, potentially compromising their data or leading to unauthorized actions.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.