Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass (CVE-2026-102577) | HOL Guard CVE

Medium · CVSS 4.3CVE-2026-102577

Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass

Answer in brief

CVE-2026-102577 records a Medium severity (CVSS 4.3) vulnerability in Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass. 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 4.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 4.3. 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. Incorrect handling of IPv4-mapped IPv6 addresses within the URL downloader's host-blocking logic allows an authenticated remote user to bypass blocked-host restrictions. By supplying a crafted URL, an attacker can induce the server to make requests to restricted destinations, leading to Server-Side Request Forgery (SSRF).

Quoted source text, attributed separately from HOL analysis.