CVE-2026-2717
The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2.
Does this matter?
Lower severity and a low EPSS score (0.47%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
- EPSS
- 0.47% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-93
- Source
- security@wordfence.com
References
- https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L1098
- https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L745
- https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L1098
- https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L745
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7716e77f-e899-4046-9421-86fc0c36c245?source=cve
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.