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)

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.002 (12.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-0690: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

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.