CVE-2021-41836

low-risk
Published 2021-12-14

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.

Do I need to act?

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0.30% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.8/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Fathom Analytics

Affected Vendors

Conva

References (4)

Patch https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old...
Third Party Advisory https://www.wordfence.com/vulnerability-advisories/#CVE-2021-41836
Patch https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old...
Third Party Advisory https://www.wordfence.com/vulnerability-advisories/#CVE-2021-41836
25
/ 100
low-risk
Severity 19/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal