What is CVE-2026-4351?

CVE-2026-4351 is a high-severity vulnerability in Perfmatters, classified under Path Traversal. CVSS score: 8.1/10. Published 2026-04-10.

How severe is CVE-2026-4351?

High severity. CVSS v3 base score is 8.1 out of 10.

Path Traversal in Perfmatters

CVE-2026-4351

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`/`deacti…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (6.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Affected products

Perfmatters — versions 0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

www.wordfence.com/threat-intel/vulnerabilities/id/c172ab2b-ce1f-4a0d-b31f-b75ff…
perfmatters.io/docs/changelog/

Frequently asked questions

What is CVE-2026-4351?: CVE-2026-4351 is a high-severity vulnerability in Perfmatters, classified under Path Traversal. CVSS score: 8.1/10. Published 2026-04-10.
How severe is CVE-2026-4351?: High severity. CVSS v3 base score is 8.1 out of 10.