CVE-2026-3903: CSRF in Modular DS WordPress Plugin

The primary impact of this CSRF vulnerability lies in the potential for unauthorized disconnection of the plugin's OAuth/SSO connection. An attacker could craft a malicious link that, when clicked by a site administrator, would trigger a forged request to disconnect the OAuth/SSO integration. This could disrupt automated website monitoring, updating, and backup processes, potentially leading to data loss or service interruptions. While the attacker doesn't gain direct access to sensitive data, the disruption of critical website management functions represents a significant risk, particularly for users heavily reliant on the plugin's automation features. The attack requires social engineering to trick an administrator into clicking the malicious link, but the ease of crafting such links makes it a relatively accessible attack vector.

1. Reserved2026-03-10
2. Published2026-03-11
3. Modified2026-04-08
4. EPSS updated2026-03-23

The primary mitigation for CVE-2026-3903 is to immediately upgrade the Modular DS plugin to version 2.6.0 or later, which includes the necessary nonce validation to prevent CSRF attacks. If upgrading is not immediately feasible due to compatibility issues or breaking changes, consider implementing a Web Application Firewall (WAF) rule to block requests to the postConfirmOauth() endpoint that lack a valid nonce. Additionally, educate administrators about the risks of clicking on suspicious links and encourage them to verify the legitimacy of any requests before taking action. Regularly review WordPress plugin configurations and permissions to minimize the potential attack surface.

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