CVE-2026-4351Network attack vector

Subscriber-level file overwrite via snippets path traversal

Published Apr 10, 2026 · Updated Apr 10, 2026

Path traversal in Perfmatters 2.5.9 and earlier allows remote authenticated users to overwrite server files through snippet bulk actions. PMCS::action_handler accepts unsanitized snippets[] paths for activate or deactivate without authorization or nonce validation, and Snippet::update passes the traversed path to file_put_contents. Subscriber-level access is sufficient; writes contain a fixed PHP docblock and can interrupt the WordPress site by corrupting .htaccess or index.php.

CVSS severity8.1
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Perfmatters 2.5.9 and earlier allows remote authenticated users to overwrite server files through snippet bulk actions. PMCS::action_handler accepts unsanitized snippets[] paths for activate or deactivate without authorization or nonce validation, and Snippet::update passes the traversed path to file_put_contents. Subscriber-level access is sufficient; writes contain a fixed PHP docblock and can interrupt the WordPress site by corrupting .htaccess or index.php.

The record

CVE
CVE-2026-4351
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
forgemedia LLC
Product
Perfmatters
Classifications
CWE-22, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.5.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

forgemedia LLC · Perfmattersversion=0 <=2.5.9

Published CVSS scores

8.1WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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