CVE-2026-2717
HTTP Headers <= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values
- State
- Published
- Severity
- 5.5 Medium
- Published
- Apr 22, 2026
- Updated
- Apr 22, 2026
- Reserved
- Feb 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.5 Medium | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H | Wordfence |
Weaknesses
- CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
Affected Products
| Product | Versions |
|---|---|
HTTP Headerszinoui |
|
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7716e77f-e899-4046-9421-86fc0c36c245?source=cve
- https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L1098
- https://plugins.trac.wordpress.org/browser/http-headers/trunk/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#L745
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