HTTP Headers WordPress Plugin CVE-2026-2717

EUVD-2026-24637 MEDIUM

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

2026-04-22 Wordfence

GHSA-r256-59w3-3gr2

WordPress Denial Of Service Apache

5.5

CVSS 3.1

CVSS VectorNVD

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

Lifecycle Timeline

Analysis Generated

Apr 22, 2026 - 10:02 vuln.today

DescriptionNVD

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.

AnalysisAI

CRLF injection in HTTP Headers WordPress plugin up to version 1.19.2 allows authenticated administrators to inject arbitrary Apache directives into .htaccess files via unsanitized custom header fields, causing configuration parse errors and potential site-wide denial of service. Attack requires Administrator-level WordPress access and no user interaction. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

Full analysis requires sign-in

Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

CVE-2026-2717 vulnerability details – vuln.today

Back