CVE-2026-102577 Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass
Authenticated attackers can bypass host restrictions in Moodle's URL downloader using IPv4-mapped IPv6 addresses to perform Server-Side Request Forgery.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-102577?
CVE-2026-102577 is a medium-severity server-side request forgery vulnerability in Moodle Moodle, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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).
Weakness: CWE-918
Which versions are affected by CVE-2026-102577?
1 open source package ship an affected version, including moodle. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
moodle Bitnami | All versions | 4.5.13, 5.0.9, 5.1.6, 5.2.2 |
Products include Moodle Moodle.
How do I fix CVE-2026-102577?
Upgrade moodle to a fixed version for your release line: 4.5.13, 5.0.9, 5.1.6 or 5.2.2.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-102577 being exploited?
There is no known exploitation of CVE-2026-102577 in the wild and no public exploit code.
Other vulnerabilities in Moodle Moodle
- CVE-2006-4935 File upload in n/a
- CVE-2006-4936 Moodle does not properly validate module instance id
- CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors.
- CVE-2004-2235 Cross-site scripting in n/a
- CVE-2004-2236 Other in n/a
Sources
Also known as BIT-moodle-2026-102577, GHSA-29qm-g73m-2r7h, UBUNTU-CVE-2026-102577.