CVE-2026-39971
CVE-2026-39971 · Serendipity: Host Header Injection leads to SMTP header injection via unvalidated HTTP_HOST
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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.
CVSS 7.2 · Hoch · EPSS 0,3% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: php
Betroffene Produkte und Versionen
serendipity
- Softwareversionen
- < 2.6.0: Betroffen
Keine Korrektur veröffentlicht
s9y/serendipity Packagist
- Softwareversionen
- 2.0.0
- 2.0.1
- 2.0.2
- 2.0.3
- 2.0.4
- 2.0.5
- 2.1-beta1
- 2.1-beta2
- 2.1-beta3
- 2.1-rc1
- 2.1.0
- 2.1.1
- 2.1.2
- 2.1.3
- 2.1.4
- 2.1.5
- 2.1.6
- 2.2.1-alpha1
- 2.3-beta1
- 2.3-rc1
- 2.3.0
- 2.3.1
- 2.3.2
- 2.3.3
- 2.3.4
- 2.3.5
- 2.4-beta1
- 2.4.0
- 2.5-beta1
- 2.5.0
- 2.6-beta1
- Betroffene Versionsbereiche
- ECOSYSTEM: < 2.6.0
Auf 2.6.0 aktualisieren