PT-2026-34272 · Zinoui · Http Headers

Kai Aizen · Published 2026-04-22 · Updated 2026-04-22 · CVE-2026-2717

Mitre

CVSS v3.1

5.5

Medium

AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via insert with markers(). This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the 'Custom Headers' settings, leading to Apache configuration parse errors and potential site-wide denial of service.

Fix

Weakness Enumeration

CWE-93

Related Identifiers

CVE-2026-2717

Affected Products

Http Headers

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-2717 · Security Note
• https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L1098 · Note
• https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L745 · Note
• https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L1098 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/7716e77f-e899-4046-9421-86fc0c36c245?source=cve · Note
• https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L745 · Note