CVE-2021-41836

Published: Dec 14, 2021Modified: Jun 17, 2026

4.8

Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Exploitability: 1.7 / Impact: 2.7

Source: security@wordfence.com (Secondary)

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 (1)

Products: Conva: Fathom Analytics

1 product

Fathom Analytics

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Conva Fathom Analytics	Up to 3.0.4

Related CWEs

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (4)

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2641005%40fathom-analytics&new=2641005%40fathom-analytics&sfp_email=&sfph_mail=

Source: security@wordfence.com

PatchThird Party Advisory

https://www.wordfence.com/vulnerability-advisories/#CVE-2021-41836

Source: security@wordfence.com

Third Party Advisory

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2641005%40fathom-analytics&new=2641005%40fathom-analytics&sfp_email=&sfph_mail=

Source: af854a3a-2127-422b-91ae-364da2661108

PatchThird Party Advisory

https://www.wordfence.com/vulnerability-advisories/#CVE-2021-41836

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

Timeline

No history available yet.