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High severity · published Jul 2, 2026
CVE-2026-13251
Perfmatters <= 2.6.4 - Unauthenticated Arbitrary File Read via 's' Parameter
7.5
CVSS
0.9%
EPSS
No
On KEV
Description
The Perfmatters plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.6.4 via the 's' parameter. This makes it possible for unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. Exploitation requires the Local Google Fonts feature to be enabled (disabled by default), pretty permalinks to be active, and RSS feed links to remain enabled in the plugin settings.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 61% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PE
Perfmatters · perfmatters
through 2.6.4 · source: vendor
Affected product
PE
Perfmatters
perfmatters
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-13251
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-13251
perfmatters.io
https://perfmatters.io/docs/changelog/
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/perfmatters/trunk/inc/classes/Fonts.php#L131
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/2c0082ff-2a33-44e9-b0d0-8b9a404ab648?source=cve
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