CVE-2026-3903 Modular Connector <= 2.5.1 - Cross-Site Request Forgery via postConfirmOauth
Unauthenticated attackers can disconnect the plugin's OAuth/SSO connection by tricking administrators into clicking a link due to missing nonce validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-3903?
CVE-2026-3903 is a medium-severity vulnerability in modulards Modular DS: Monitor, update, and backup multiple websites, published on 11 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-352
Which versions are affected by CVE-2026-3903?
How do I fix CVE-2026-3903?
No fix has been published for CVE-2026-3903 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3903 being exploited?
There is no known exploitation of CVE-2026-3903 in the wild and no public exploit code.
Sources
Also known as GHSA-6qpq-j4q7-x5cr.