Moodle: xss in forum post templates due to insufficient escaping (CVE-2026-102581) | HOL Guard CVE

Medium · CVSS 4.6CVE-2026-102581

Moodle: xss in forum post templates due to insufficient escaping

Answer in brief

CVE-2026-102581 records a Medium severity (CVSS 4.6) vulnerability in Moodle: xss in forum post templates due to insufficient escaping. The current sources do not mark it as known exploited. The current feed maps moodle (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 4.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps moodle (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
moodlegeneric	>=5.2.0 <5.2.2 \|\| >=5.1.0 <5.1.6 \|\| >=5.0.0 <5.0.9 \|\| >=0 <4.5.13	5.2.2, 5.1.6, 5.0.9, 4.5.13

Recommended response

Check inventory. Check lockfiles and deployed manifests for moodle.
Review the reported fix. Update moodle to 5.2.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.