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TI-2026-03787 Aliases CVE-2026-4351GHSA-9m4j-jrjw-j2xh

Perfmatters <= 2.5.9 - Authenticated (Subscriber+) Arbitrary File Overwrite via 'snippets' Parameter

Priority LOW 35CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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`.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00416 36th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PerfmattersPerfmattersup to 2.5.9—No fix listedCNA
  • Perfmatters VendorPerfmatters Affected up to 2.5.9 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:perfmatters:perfmatters:*:*:*:*:*:*:*:*——Perfmatters
  • cpe:2.3:a:perfmatters:perfmatters:*:*:*:*:*:*:*:* Versions — — ·Perfmatters

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4351
  2. 2026-10-03 Alias added: GHSA-9m4j-jrjw-j2xh

References

Other 2

  • TI-2026-11255 Perfmatters <= 2.6.4 - Unauthenticated Arbitrary File Read via 's' Parameter CVSS 3.1HIGH 7.5
  • TI-2023-25978 WordPress Perfmatters Plugin <= 2.1.6 is vulnerable to Broken Access Control CVSS 3.1HIGH 8.8
  • TI-2026-03786 Perfmatters <= 2.5.9.1 - Authenticated (Subscriber+) Arbitrary File Deletion via 'delete' Parameter CVSS 3.1HIGH 8.1
  • TI-2023-25979 WordPress Perfmatters Plugin <= 2.1.6 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
  • TI-2026-41495 WordPress perfmatters plugin <= 2.6.4 - Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
  • TI-2023-25980 WordPress Perfmatters Plugin <= 2.1.6 is vulnerable to Cross Site Scripting (XSS) CVSS 3.1HIGH 7.1
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences