CVE-2026-2717

Summary

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.

Affected Software

Weaknesses

• CWE-93: CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

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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