Perfmatters <= 2.5.9 - Authenticated (Subscriber+) Arbitrary File Overwrite via 'snippets' Parameter
| CVE | CVE-2026-4351 |
|---|---|
| CVSS | 8.1 (High) |
| Publicly Published | April 9, 2026 |
| Last Updated | April 10, 2026 |
| Researcher |
h0xilo
|
Description
The Perfmatters plugin for WordPress is vulnerable to arbitrary file overwrite via path traversal in all versions up to, and including, 2.5.9. This is due to the `PMCS::action_handler()` method processing the bulk action `activate`/`deactivate` handlers without any authorization check or nonce verification. The `$_GET['snippets'][]` values are passed unsanitized to `Snippet::activate()`/`Snippet::deactivate()` which call `Snippet::update()` then `file_put_contents()` with the traversed path. This makes it possible for authenticated attackers, with Subscriber-level access and above, to overwrite arbitrary files on the server with a fixed PHP docblock content, potentially causing denial of service by corrupting critical files like `.htaccess` or `index.php`.
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Vulnerability Details for Perfmatters
| Software Type | Plugin |
|---|---|
| Software Slug | perfmatters |
| Patched? | Yes |
| Remediation | Update to version 2.6.0, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Perfmatters
| # | Title | CVE ID | CVSS | Researchers | Date |
|---|---|---|---|---|---|
| 1 | Perfmatters <= 2.6.4 - Unauthenticated Arbitrary File Read via 's' Parameter | CVE-2026-13251 | daroo | July 1, 2026 | |
| 2 | Perfmatters <= 2.6.4 - Unauthenticated Stored Cross-Site Scripting | CVE-2026-57671 | daroo | June 30, 2026 | |
| 3 | Perfmatters <= 2.6.3 - Reflected Cross-Site Scripting | CVE-2026-56047 | dutafi | June 25, 2026 | |
| 4 | Perfmatters <= 2.5.9.1 - Authenticated (Subscriber+) Arbitrary File Deletion via 'delete' Parameter | CVE-2026-4350 | h0xilo | April 2, 2026 | |
| 5 | Perfmatters < 2.2.0 - Authenticated (Subscriber+) Stored Cross-Site Scripting | CVE-2023-47877 | Dave Jong | November 21, 2023 | |
| 6 | Perfmatters <= 2.1.6 - Reflected Cross-Site Scripting | CVE-2023-47876 | Dave Jong | November 21, 2023 | |
| 7 | Perfmatters <= 2.1.6 - Cross-Site Request Forgery | CVE-2023-47875 | Dave Jong | November 21, 2023 | |
| 8 | Perfmatters <= 2.1.6 - Missing Authorization | CVE-2023-47874 | Dave Jong | November 20, 2023 |
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