CVE-2026-4132 Path traversal in HTTP Headers
Administrators can achieve remote code execution by writing arbitrary PHP code to server files via unsanitized path and username parameters.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4132?
CVE-2026-4132 is a high-severity path traversal vulnerability in zinoui HTTP Headers, published on 22 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The HTTP Headers plugin for WordPress is vulnerable to External Control of File Name or Path leading to Remote Code Execution in all versions up to and including 1.19.2. This is due to insufficient validation of the file path stored in the 'hh_htpasswd_path' option and lack of sanitization on the 'hh_www_authenticate_user' option value. The plugin allows administrators to set an arbitrary file path for the htpasswd file location and does not validate that the path has a safe file extension (e.g., restricting to .htpasswd). Additionally, the username field used for HTTP Basic Authentication is written directly into the file without sanitization. The apache_auth_credentials() function constructs the file content using the unsanitized username via sprintf('%s:{SHA}%s', $user, ...), and update_auth_credentials() writes this content to the attacker-controlled path via file_put_contents(). This makes it possible for authenticated attackers, with Administrator-level access and above, to write arbitrary content (including PHP code) to arbitrary file paths on the server, effectively achieving Remote Code Execution.
Weakness: CWE-73
Which versions are affected by CVE-2026-4132?
How do I fix CVE-2026-4132?
No fix has been published for CVE-2026-4132 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-4132 being exploited?
There is no known exploitation of CVE-2026-4132 in the wild and no public exploit code.
Sources
Also known as GHSA-gg9v-56ph-3gr7.