Is CVE-2026-102577 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-102577 being exploited in the wild.

How severe is CVE-2026-102577?

Medium severity, with a CVSS score of 4.3, published 30 September 2026.

Is there a fix for CVE-2026-102577?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-102577 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-102577?

Check whether you run Moodle. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-102577: Moodle SSRF in URL downloader IPv4-mapped IPv6 bypass

CVE-2026-102577 · Severity: medium · CVSS 4.3 · Published 2026-09-30

Moodle, an open-source learning management system used by educational institutions worldwide, contains a flaw in its URL downloader's security controls. An authenticated attacker can bypass host-blocking restrictions by using IPv4-mapped IPv6 addresses, potentially allowing them to access internal systems or private networks from the Moodle server—an attack known as Server-Side Request Forgery. This could lead to unauthorized access to sensitive data or internal services.

Technologies: Moodle. Vendors: Moodle.

Quick answers

Is CVE-2026-102577 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-102577 being exploited in the wild.
How severe is CVE-2026-102577?: Medium severity, with a CVSS score of 4.3, published 30 September 2026.
Which products and versions are affected?: Moodle Moodle.
Is there a fix for CVE-2026-102577?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-102577 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-102577?: Check whether you run Moodle. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability exists in Moodle's URL downloader component, which fails to properly validate IPv4-mapped IPv6 addresses (e.g., ::ffff:127.0.0.1) against the configured host-blocking allowlist. An authenticated remote attacker can craft a URL using this format to bypass the restriction logic and cause the server to make requests to blocked destinations. This is a classic SSRF attack vector requiring authentication as a precondition.

Affected products

Moodle Moodle

Timeline

2026-09-30: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.