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CVE-2026-2717

HTTP Headers <= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values

Published: Apr 22, 2026Updated: Apr 22, 2026 Sources: CVE List NVD
NVD MITRE
5.5CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:NI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High

Weaknesses

CWE-93

Affected Products

HTTP Headers
zinoui

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

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
and 2 more references View all →

Timeline

Published
Apr 22, 2026
Last Updated
Apr 22, 2026

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