High severity · published Jan 9, 2026
CVE-2025-15057
SlimStat Analytics <= 5.3.3 - Unauthenticated Stored Cross-Site Scripting via 'fh' Parameter
7.2
CVSS
0.3%
EPSS
No
On KEV
Description
The SlimStat Analytics plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `fh` (fingerprint) parameter in all versions up to, and including, 5.3.3. This is due to insufficient input sanitization and output escaping on the fingerprint value stored in the database. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever an administrator views the Real-time Access Log report.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SA
SlimStat Analytics · veronalabs
through 5.3.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-15057
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-15057
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3428488/wp-slimstat
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/90920df9-1362-466b-b14b-4714087f556b?source=cve
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