High severity · published Mar 19, 2026
CVE-2026-1238
SlimStat Analytics <= 5.3.5 - Unauthenticated Stored Cross-Site Scripting via 'fh'
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, 5.3.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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 25% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SA
SlimStat Analytics · veronalabs
through 5.3.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1238
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1238
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/wp-slimstat/tags/5.3.5/admin/view/right-now.php#L185
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/wp-slimstat/tags/5.3.5/wp-slimstat.php#L1948
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3477417/
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/e991fbdf-8e26-4d2e-8e3b-c8990914dcad?source=cve
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