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CVE-2026-102577— Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass

Quick assessment

Affected
CVE-2026-102577
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Moodle 中发现了一个漏洞。URL 下载器中的主机阻止逻辑对 IPv4 映射的 IPv6 地址处理不当，使得经过身份验证的远程用户可以绕过被阻止的主机限制。攻击者通过提供精心构造的 URL，可诱导服务器向受限目标发起请求，从而导致服务端请求伪造（SSRF）漏洞。

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1090 · Proxy

I. Basic Information for CVE-2026-102577

Vulnerability Information
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Vulnerability Title
Moodle: ssrf risk in url downloader via ipv4-mapped ipv6 address bypass
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 5.2.0 ~ 5.2.2 -

II. Public POCs for CVE-2026-102577

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-102577

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Other References for CVE-2026-102577 (4)

IV. Related Vulnerabilities

Same weakness: CWE-918

V. Comments for CVE-2026-102577

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