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CVE-2021-41836: The Fathom Analytics WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and escaping via the $site_id parameter found in the ~/fathom-analytics.php file

medium Affects fathom-analytics (WordPress plugin). Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

The Fathom Analytics WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and escaping via the $site_id parameter found in the ~/fathom-analytics.php file

Package
fathom-analytics (WordPress plugin) WordPress
Affected versions
<=3.0.4
Fixed in
no fix recorded
Severity
medium  CVSS 4.8
Exploitation
not on CISA KEV · EPSS 1% (47.8th percentile)
Published
2021-12-14
Source
nvd

References

CWE-79
NVD recordfathom-analytics (WordPress plugin) advisories

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