CVE-2026-39971
Gravedad CVSS v3.1:
ALTA
Tipo:
CWE-113
Neutralización incorrecta de secuencias CRLF en cabeceras HTTP (División de respuesta HTTP)
Fecha de publicación:
15/04/2026
Última modificación:
17/04/2026
Descripción
*** Pendiente de traducción *** Serendipity is a PHP-powered weblog engine. In versions 2.6-beta2 and below, the email sending functionality in include/functions.inc.php inserts $_SERVER['HTTP_HOST'] directly into the Message-ID SMTP header without validation, and the existing sanitization function serendipity_isResponseClean() is not called on HTTP_HOST before embedding it. An attacker who can control the Host header during an email-triggering action such as comment notifications or subscription emails can inject arbitrary SMTP headers into outgoing emails. This enables identity spoofing, reply hijacking via manipulated Message-ID threading, and email reputation abuse through the attacker's domain being embedded in legitimate mail headers. This issue has been fixed in version 2.6.0.
Impacto
Puntuación base 3.x
7.20
Gravedad 3.x
ALTA