What is CVE-2026-3903?

CVE-2026-3903 is a medium-severity vulnerability in Modulards Modular Ds: Monitor, Update, And Backup Multiple Websites, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2026-03-11.

How severe is CVE-2026-3903?

Medium severity. CVSS v3 base score is 4.3 out of 10.

CSRF in Modulards Modular Ds: Monitor, Update, And Backup Multiple Websites

CVE-2026-3903

The Modular DS: Monitor, update, and backup multiple websites plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.5.1. This is due to missing nonce validation on the postConfirmOauth() function. This makes it possible for unauthenticated attackers to disconnect the plugin's OAuth/SSO connection via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Vulnerability class: CSRF (Cross-Site Request Forgery)

EPSS: 0.001 (1.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Modulards Modular Ds: Monitor, Update, And Backup Multiple Websites — versions 0

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

Frequently asked questions

What is CVE-2026-3903?: CVE-2026-3903 is a medium-severity vulnerability in Modulards Modular Ds: Monitor, Update, And Backup Multiple Websites, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2026-03-11.
How severe is CVE-2026-3903?: Medium severity. CVSS v3 base score is 4.3 out of 10.