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Vulnerabilities

Vulnerability · 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.

Published Apr 10, 2026 · catalog updated Jun 17, 2026 · The Perfmatters plugin for

Check if you run it

No confirmed exploitation is on record for CVE-2026-4351. EPSS is 0.53%. Act only if a listed version of The Perfmatters plugin for is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The Perfmatters plugin for).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.53%
Remediation
Version ranges on file
Affected products
stated named in the record

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 method processing the bulk action / handlers without any authorization check or nonce verification. The values are passed unsanitized to / which call then 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 or .

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated named in the record<= 2.5.9

How to fix CVE-2026-4351

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-4351. EPSS is 0.53%. Act only if a listed version of The Perfmatters plugin for is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 2.5.9. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-22: Path Traversal. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 10, 2026 · NIST NVD

    Detected

    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 method processing the bulk action / handlers without any authorization check or nonce verification. The values are passed unsanitized to / which call then with the traversed path. This makes it possible for authenticated attackers, with S

  2. Jun 17, 2026 · NIST NVD

    Updated

    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 method processing the bulk action / handlers without any authorization check or nonce verification. The values are passed unsanitized to / which call then with the traversed path. This makes it possible for authenticated attackers, with S

Sources

  • CVE.orgVulnerability recordCVE-2026-4351

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4351

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-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 method processing the bulk action / handlers without any authorization

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.