CVE Watch18 ago 2026

CVE-2026-45123

MyBB is free and open source forum software. Prior to 1.8.40, the remote requests feature does not correctly handle IPv6 addresses, resultin

CVSS

4.3

Medio

EPSS

0.3%

p19

KEV

—

Exploit Today

0-100

Publicado: 18 ago 2026 · Última mod.: 18 ago 2026 · CWE-918

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-08-192026-08-31

Descripción técnica

MyBB is free and open source forum software. Prior to 1.8.40, the remote requests feature does not correctly handle IPv6 addresses, resulting in a server-side request forgery vulnerability. The default disallowed remote hosts list does not include IPv6 addresses. Verification in fetch_remote_file() fails open when get_ip_by_hostname() returns no result because that function does not return IPv6 results, allowing a crafted remote target to bypass the host restriction. The uniquely identifying implementation details include fail-open verification, and inc/functions.php. This issue is fixed in version 1.8.40.

Referencias oficiales

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