XSS in Recaptcha By Webdesignby

CVE-2026-4512

The reCaptcha by WebDesignBy WordPress plugin before 2.0 does not sanitize or escape the Site Key setting before outputting it in a JavaScript string context via the grecaptcha_js() function. This allows administrators on multisite installations (who do not have the unfiltered_html capability) to inject arbitrary JavaScript that executes for all visitors to the WordPress login page.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (13.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.9% 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-2026-4512: held from 0.002 to 0.002.

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

Affected products

  • Recaptcha By Webdesignby — versions 0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-4512?
CVE-2026-4512 is a low-severity vulnerability in Recaptcha By Webdesignby, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-04-23.
How severe is CVE-2026-4512?
Low severity. CVSS v3 base score is 3.5 out of 10.