CVE-2026-13694 in Bit Form Plugin
Summary
by MITRE • 07/21/2026
The Bit Form WordPress plugin before 3.1.0 does not properly validate its workflow-trigger token once the associated transient has expired, allowing unauthenticated attackers to re-trigger a form's configured workflow actions such as notification emails and integrations.
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Analysis
by VulDB Data Team • 07/21/2026
The vulnerability in the Bit Form WordPress plugin affects versions prior to 3.1.0 and represents a critical authentication bypass flaw that undermines the plugin's security model. This issue stems from improper validation of workflow trigger tokens after their associated transient storage has expired, creating a window where attackers can exploit the system without proper authentication. The vulnerability specifically targets the plugin's workflow execution mechanism, which is designed to handle automated actions such as sending notification emails and integrating with external services when form submissions occur.
The technical flaw manifests in the plugin's token validation logic where it fails to properly verify that a workflow trigger token remains valid even after the transient data has expired. This design oversight allows attackers to reuse expired tokens to initiate configured workflow actions, effectively bypassing the authentication requirements that should normally prevent unauthorized access to these automated processes. The transient storage mechanism is intended to provide temporary security validation, but the lack of proper expiration checking creates a persistent vulnerability that can be exploited repeatedly.
From an operational impact perspective, this vulnerability enables unauthenticated attackers to trigger various automated workflow actions configured within the Bit Form plugin. Attackers can potentially flood target systems with notification emails, spam external integrations, or abuse webhook connections to generate unwanted traffic and data processing loads. The security implications extend beyond simple spamming as these workflow actions often involve sending sensitive information through email notifications or connecting to third-party services, potentially exposing confidential data or creating opportunities for further attacks.
The vulnerability aligns with CWE-863 (Incorrect Authorization) and falls under ATT&CK technique T1078 (Valid Accounts) as it exploits legitimate workflow mechanisms to perform unauthorized actions. Organizations using affected versions of the Bit Form plugin face significant risks including potential data leakage through email notifications, service abuse leading to rate limiting or denial of service conditions, and possible exploitation of integrations with external systems. The impact is particularly concerning in environments where forms are used for sensitive data collection or where workflow actions involve privileged operations.
Security mitigation requires immediate upgrade to Bit Form plugin version 3.1.0 or later, which implements proper token validation mechanisms that check both the transient validity and associated token authenticity. Administrators should also review existing workflow configurations to identify any potentially compromised automated actions and monitor system logs for suspicious activity patterns. Additional protective measures include implementing rate limiting on form submission endpoints, validating referer headers, and restricting access to workflow trigger endpoints through firewall rules or authentication layers where possible. The fix addresses the root cause by ensuring that expired transients cannot be reused to trigger workflow actions, thereby restoring proper authorization controls within the plugin's security framework.