CVE Watch18 ago 2026

CVE-2026-45115

MyBB is free and open source forum software. Prior to 1.8.40, the Buddy/Ignore component does not sanitize usernames correctly, allowing att

CVSS

8.7

Alto

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Publicado: 18 ago 2026 · Última mod.: 18 ago 2026 · CWE-79

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-08-192026-09-06

Descripción técnica

MyBB is free and open source forum software. Prior to 1.8.40, the Buddy/Ignore component does not sanitize usernames correctly, allowing attackers to perform JavaScript code injection through a specially crafted username. The User CP Buddy/Ignore list and the Select Buddies list in Private Messages pass usernames through htmlspecialchars_uni(), which may leave single quotes unescaped. The payload is triggered when a victim chooses Yes in Please Confirm while removing the username in usercp.php, or selects the username through the onclick handler in the xmlhttp.php Select Buddies popup. The uniquely identifying implementation details include Private Messages Select Buddies list, and unescaped single quotes. This issue is fixed in version 1.8.40.

Referencias oficiales

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