The PhastPress plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Read via null byte injection in all versions up to, and including, 3.7. This is due to a discrepancy between the extension validation in `getExtensionForURL()` which operates on URL-decoded paths, and `appendNormalized()` which strips everything after a null byte before constructing the filesystem path. This makes it possible for unauthenticated attackers to read arbitrary files from the webroot, including wp-config.php, by appending a double URL-encoded null byte (%2500) followed by an allowed extension (.txt) to the file path.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Phastpress Plugin | — | Update phastpress plugin to version 3.8, or a newer patched version | Dec 23, 2025 | Dec 22, 2025 |
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