A HIGH-severity vulnerability identified as CVE-2026-4350 has been published on April 3, 2026 with a CVSS base score of 8.1. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.
Vulnerability Details
CVE ID: CVE-2026-4350
Severity: HIGH
CVSS Score: 8.1
Published: April 3, 2026
Weakness (CWE): CWE-22
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Confidentiality Impact | None |
| Integrity Impact | High |
| Availability Impact | High |
Technical Description
The Perfmatters plugin for WordPress is vulnerable to arbitrary file deletion via path traversal in all versions up to, and including, 2.5.9.1. This is due to the `PMCS::action_handler()` method processing the `$_GET['delete']` parameter without any sanitization, authorization check, or nonce verification. The unsanitized filename is concatenated with the storage directory path and passed to `unlink()`. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server by using `../` path traversal sequences, including `wp-config.php` which would force WordPress into the installation wizard and allow full site takeover.
Potential Impact
If exploited, this high-severity vulnerability could allow an attacker to tamper with system integrity, cause a denial of service. Organizations running affected software should treat this as a priority remediation item.
Recommended Action
No official patch is available yet. Until one is released:
- Monitor the official NVD page and vendor channels for patch announcements.
- Restrict access to the affected system or service where possible.
- Apply network-level mitigations such as firewall rules or WAF policies.
- Enable logging and alerting for anomalous activity related to this vulnerability.
- Review your incident response plan in case of active exploitation.
References
Related Security Advisories
- [HIGH] CVE-2025-14675 — CVSS 7.2 (March 7, 2026) — HIGH / CVSS 7.2
- [HIGH] CVE-2026-26202 — CVSS 7.5 — HIGH / CVSS 7.5
- [HIGH] CVE-2026-0686 — CVSS 7.2 (April 2, 2026) — HIGH / CVSS 7.2
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