CVE-2026-1310 in Simple Calendar for Elementor Plugin
Summary
by MITRE • 01/28/2026
The Simple calendar for Elementor plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 1.6.6. This is due to missing capability checks on the `miga_ajax_editor_cal_delete` function that is hooked to the `miga_editor_cal_delete` AJAX action with both authenticated and unauthenticated access enabled. This makes it possible for unauthenticated attackers to delete arbitrary calendar entries by sending a request with a valid nonce and the calendar entry ID.
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Analysis
by VulDB Data Team • 01/29/2026
The Simple calendar for Elementor plugin presents a critical authorization flaw that compromises the security of WordPress installations. This vulnerability exists in versions up to and including 1.6.6, where the plugin fails to implement proper capability checks for its administrative functions. The specific issue resides within the `miga_ajax_editor_cal_delete` function which handles calendar entry deletion operations through the `miga_editor_cal_delete` AJAX action. This function lacks essential permission validation that should prevent unauthorized users from executing administrative tasks, creating a dangerous access control gap in the plugin's security architecture.
The technical implementation of this vulnerability allows attackers to exploit the missing authorization checks by crafting malicious requests that target the vulnerable AJAX endpoint. The flaw specifically enables unauthenticated attackers to delete calendar entries by submitting requests containing valid nonces and calendar entry identifiers. This represents a classic authorization bypass vulnerability where the system fails to verify whether the requesting user possesses the necessary privileges to perform the requested operation. The vulnerability operates at the application layer and demonstrates poor defensive programming practices that violate fundamental security principles.
The operational impact of this vulnerability extends beyond simple data loss, as it provides attackers with the ability to manipulate calendar data without authentication. This could result in disruption of calendar services, potential data corruption, or even serve as a stepping stone for further attacks within the compromised WordPress environment. The vulnerability affects all users regardless of their authentication status, making it particularly dangerous as it can be exploited by anyone who can access the site's frontend. This type of vulnerability aligns with CWE-863, which describes "Incorrect Authorization" where the system fails to properly verify access rights for operations that require specific privileges.
Organizations using this plugin face significant risks including potential service disruption, data integrity issues, and possible escalation to more severe attacks. The vulnerability's exploitation requires minimal technical skill and can be automated, making it attractive to threat actors. Security practitioners should note that this vulnerability violates several ATT&CK framework techniques including T1078 for valid accounts and T1496 for resource hijacking, as attackers can leverage the compromised calendar functionality to gain unauthorized access to system resources. The risk assessment should consider the plugin's user base and the potential for automated exploitation through reconnaissance activities.
Mitigation strategies should focus on immediate plugin updates to versions that address the authorization flaw, as well as implementing additional security measures such as rate limiting for AJAX endpoints and monitoring for unusual deletion patterns. Network-level protections including web application firewalls can help detect and block exploitation attempts. Administrators should also consider implementing role-based access controls and regularly auditing plugin permissions to prevent similar vulnerabilities from emerging in other components. The incident highlights the importance of proper input validation and capability checking in WordPress plugin development, emphasizing that all administrative functions must verify user privileges before executing sensitive operations.