CVE-2025-15055: SlimStat Analytics <= 5.3.4 - Unauthenticated Stored Cross-Site Scripting via 'notes/resource' Parameters

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-09 · updated 2026-06-17
Weakness: CWE-79

Description

The SlimStat Analytics plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'notes' and 'resource' parameters in all versions up to, and including, 5.3.4 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 an administrator accesses the Recent Custom Events report.

Affected products

veronalabs SlimStat Analytics: through 5.3.4

References

https://plugins.trac.wordpress.org/changeset/3429990/wp-slimstat
https://www.wordfence.com/threat-intel/vulnerabilities/id/afbfabfc-b923-4fe9-9e8f-0cf159f488db?source=cve

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