CVE-2025-8293 in Intl DateTime Calendar Plugin
Summary
by MITRE • 08/16/2025
The Intl DateTime Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘date’ parameter in all versions up to, and including, 1.0.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 08/19/2025
The CVE-2025-8293 vulnerability affects the Intl DateTime Calendar plugin for WordPress, representing a critical stored cross-site scripting flaw that undermines web application security. This vulnerability exists within all versions up to and including 1.0.1, making it a widespread concern for WordPress installations that utilize this plugin. The flaw stems from inadequate input sanitization and output escaping mechanisms within the plugin's handling of the 'date' parameter, creating a persistent security weakness that can be exploited by malicious actors with relatively low privileges.
The technical implementation of this vulnerability allows authenticated attackers who possess Contributor-level access or higher to inject malicious JavaScript code through the date parameter. When properly crafted, this injected code becomes permanently stored within the plugin's data handling mechanisms, making it persistent across multiple user sessions. The vulnerability's exploitation requires minimal privileges compared to many other XSS flaws, as it targets users with Contributor access levels rather than administrators, significantly expanding the potential attack surface. This stored nature means that every user who accesses pages containing the injected content becomes a potential victim, as the malicious script executes in their browser context whenever they navigate to affected pages.
The operational impact of CVE-2025-8293 extends beyond simple script execution, as it can enable sophisticated attack vectors including session hijacking, credential theft, and data exfiltration. Attackers can leverage this vulnerability to establish persistent access to compromised WordPress sites, potentially using it as a foothold for further attacks within the network. The vulnerability's classification aligns with CWE-79, which specifically addresses cross-site scripting flaws, and follows patterns commonly seen in ATT&CK technique T1566.001 for initial access through malicious content. The stored nature of the vulnerability makes it particularly dangerous because it can remain undetected for extended periods while continuously compromising users who access affected pages.
Mitigation strategies for CVE-2025-8293 should prioritize immediate plugin updates to versions that address the input sanitization and output escaping deficiencies. System administrators must implement comprehensive access control measures, as the vulnerability requires only Contributor-level privileges to exploit, making it essential to monitor user permissions and limit access to plugin functionalities. Security monitoring should include regular scanning for malicious code injection within WordPress installations, particularly focusing on calendar and date-related plugin components. Additionally, implementing content security policies and regular security audits of WordPress plugins can prevent similar vulnerabilities from being exploited in the future. Organizations should also consider network-level protections such as web application firewalls to detect and block malicious script injection attempts. The vulnerability underscores the importance of maintaining current plugin versions and conducting regular security assessments to identify potential attack vectors before they can be exploited by malicious actors.