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CVE-2026-2717

MEDIUM

5.5

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.

CVE Details

CVSS v3.1 Score5.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredHIGH

User InteractionNONE

Published4/22/2026

Last Modified4/22/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-93

References

https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L1098(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/http-headers/tags/1.19.2/http-headers.php#L745(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L1098(security@wordfence.com)

https://plugins.trac.wordpress.org/browser/http-headers/trunk/http-headers.php#L745(security@wordfence.com)

https://www.wordfence.com/threat-intel/vulnerabilities/id/7716e77f-e899-4046-9421-86fc0c36c245?source=cve(security@wordfence.com)

IOC Correlations

No correlations recorded

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