What is CVE-2026-0690?

CVE-2026-0690 is a medium-severity vulnerability in Flatboy Flatpm – Ad Manager, Adsense And Custom Code, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-01-20.

How severe is CVE-2026-0690?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Flatboy Flatpm – Ad Manager, Adsense And Custom Code

CVE-2026-0690

The FlatPM – Ad Manager, AdSense and Custom Code plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'rank_math_description' custom field in all versions up to, and including, 3.2.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (10.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Flatboy Flatpm – Ad Manager, Adsense And Custom Code — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-0690?: CVE-2026-0690 is a medium-severity vulnerability in Flatboy Flatpm – Ad Manager, Adsense And Custom Code, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-01-20.
How severe is CVE-2026-0690?: Medium severity. CVSS v3 base score is 6.4 out of 10.