CVE-2026-4351
Authenticated users can overwrite arbitrary files via path traversal in Perfmatters <=2.5.9.
Is CVE-2026-4351 being exploited?
Not confirmed. CVE-2026-4351 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-4351?
CVE-2026-4351 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-4351?
Yes. A fix has been recorded for CVE-2026-4351. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-4351 affect?
CVE-2026-4351 affects Perfmatters WordPress plugin <= 2.5.9. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-4351?
Update to the latest Perfmatters version
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Subscriber+ attackers can write to server files (e.g., .htaccess, index.php), causing DoS and site disruption.
Patch when possible
- affected<= 2.5.9
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.