CVE-2026-2717
MEDIUM EPSS 37.5%
Published Apr 22, 20262mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability High
Threat Intelligence
EPSS Exploit Probability
37.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-93
References 5
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L1098
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L745
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L1098
- plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L745
- wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/7716e77f-e899-4046-9421-86fc0c36c245?source=cve
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.