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CVE-2021-41836

MEDIUM 4.8 CVSS 3.1
Published
December 14, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Description

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 which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 3.0.4. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Affected products and versions

  • Fathom Analytics Fathom Analytics — From 3.0.4 (including) to 3.0.4 (including)
  • conva fathom_analytics — Up to and including 3.0.4

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2641005%40fathom-analytics&new=2641005%40fathom-analytics&sfp_email=&sfph_mail= Patch, Third Party Advisory
  • www.wordfence.com https://www.wordfence.com/vulnerability-advisories/#CVE-2021-41836 Third Party Advisory
  • nvd.nist.gov Official NVD record