---
id: CVE-2026-102581
title: A flaw was found in Moodle
summary: >-
  A flaw was found in Moodle. Insufficient output escaping in templates used to
  display forum posts enables a stored cross-site scripting (XSS) vulnerability.
  An attacker can inject malicious content into a forum post, which then
  executes …
severity: medium
cvss: 4.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-79
product: moodle
affected:
  - moodle >= 5.2.0 < 5.2.2
  - moodle >= 5.1.0 < 5.1.6
  - moodle >= 5.0.0 < 5.0.9
  - moodle < 4.5.13
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T09:17:15.213'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102581'
references:
  - url: >-
      http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88981
    label: patrick@puiterwijk.org
  - url: 'https://access.redhat.com/security/cve/CVE-2026-102581'
    label: patrick@puiterwijk.org
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543634'
    label: patrick@puiterwijk.org
  - url: 'https://moodle.org/mod/forum/discuss.php?d=482499'
    label: patrick@puiterwijk.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-30T09:00:29.912Z'
---

## Overview

A flaw was found in Moodle. Insufficient output escaping in templates used to display forum posts enables a stored cross-site scripting (XSS) vulnerability. An attacker can inject malicious content into a forum post, which then executes arbitrary script code in the browser of another user viewing the affected post.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.