CVE-2023-2407 in Event Registration Calendar Plugin
Summary
by MITRE • 06/03/2023
The Event Registration Calendar By vcita plugin, versions up to and including 3.10.0, and Online Payments – Get Paid with PayPal, Square & Stripe plugin, for WordPress are vulnerable to Cross-Site Request Forgery. This is due to missing nonce validation in the ls_parse_vcita_callback() function. This makes it possible for unauthenticated attackers to modify the plugin's settings and inject malicious JavaScript via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 04/09/2026
The vulnerability identified in CVE-2023-2407 affects two popular WordPress plugins: Event Registration Calendar By vcita and Online Payments – Get Paid with PayPal Square & Stripe. These plugins expose a critical cross-site request forgery weakness that stems from inadequate input validation mechanisms within their core functionality. The flaw specifically resides in the ls_parse_vcita_callback() function where nonce validation is completely absent, creating a pathway for malicious actors to manipulate plugin configurations without proper authentication. This vulnerability represents a significant security risk for WordPress installations that rely on these plugins for event management and payment processing operations.
The technical implementation of this vulnerability allows attackers to craft malicious requests that appear legitimate to the WordPress system. When an administrator interacts with a specially crafted link or page that triggers the vulnerable function, the absence of nonce verification means the system cannot distinguish between genuine administrative actions and forged requests. This weakness enables attackers to modify plugin settings, potentially altering payment processing configurations or event registration parameters. The vulnerability is particularly dangerous because it requires no authentication credentials from the attacker, only the ability to convince an administrator to perform a specific action, making it a classic csrf attack vector that exploits the trust relationship between the user and the web application.
The operational impact of this vulnerability extends beyond simple configuration changes to potentially compromise entire payment processing workflows and event management systems. Attackers could manipulate payment gateway settings to redirect funds to malicious accounts, alter event registration forms to collect sensitive user data, or disable critical plugin functionality. The vulnerability affects all versions up to and including 3.10.0 of the Event Registration Calendar By vcita plugin and the Online Payments plugin, indicating a widespread exposure across numerous WordPress installations that rely on these tools for business operations. This creates a substantial risk for organizations that depend on these plugins for revenue generation and customer engagement activities, as the attack surface includes not just configuration changes but also potential data exfiltration through modified registration forms.
Security mitigation strategies for this vulnerability must focus on immediate remediation through plugin updates to versions that include proper nonce validation mechanisms. Organizations should implement additional security layers including web application firewalls that can detect and block suspicious csrf patterns, regular monitoring of plugin configuration changes, and enhanced administrative access controls. The vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery weaknesses in web applications. From an ATT&CK framework perspective, this vulnerability maps to T1566.002 - Phishing: Spearphishing Attachment and T1078.004 - Valid Accounts: Cloud Accounts, as attackers must leverage social engineering to trick administrators into performing malicious actions while exploiting the trust relationship between legitimate users and the vulnerable application. Organizations should also consider implementing automated patch management systems to ensure rapid deployment of security updates and maintain comprehensive monitoring of administrative activities to detect unauthorized configuration changes that may indicate exploitation attempts.