---
id: CVE-2026-102586
title: A flaw was found in Moodle
summary: >-
  A flaw was found in Moodle. Insufficient sanitization of username input on the
  password reset page allows a remote attacker to conduct a cross-site scripting
  (XSS) attack. By convincing an unauthenticated user to access a specially
  craft…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-79
vendor: moodle
product: moodle
affected:
  - moodle < 4.5.13
  - 'moodle >= 5.0.0, < 5.0.9'
  - 'moodle >= 5.1.0, < 5.1.6'
  - 'moodle >= 5.2.0, < 5.2.2'
patched:
  - moodle 5.2.2
published: '2026-09-30'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T15:48:31.997'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102586'
references:
  - url: >-
      http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88335
    label: patrick@puiterwijk.org
  - url: 'https://access.redhat.com/security/cve/CVE-2026-102586'
    label: patrick@puiterwijk.org
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543641'
    label: patrick@puiterwijk.org
  - url: 'https://moodle.org/mod/forum/discuss.php?d=482504'
    label: patrick@puiterwijk.org
tags:
  - nvd
  - cve.org
epss: 0.00276
epssPercentile: 0.19958
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T13:56:33.265497Z'
ingestedAt: '2026-09-30T09:00:29.908Z'
---

## Overview

A flaw was found in Moodle. Insufficient sanitization of username input on the password reset page allows a remote attacker to conduct a cross-site scripting (XSS) attack. By convincing an unauthenticated user to access a specially crafted password reset link, an attacker could execute arbitrary script in the victim's browser.

## Affected

- `moodle < 4.5.13`
- `moodle >= 5.0.0, < 5.0.9`
- `moodle >= 5.1.0, < 5.1.6`
- `moodle >= 5.2.0, < 5.2.2`

## Remediation

Upgrade past the affected range:

- `moodle 5.2.2`