CVE-2026-107653 in SureCart Plugin
Summary
by MITRE • 10/31/2026
The SureCart – Ecommerce Made Easy For Selling Physical Products, Digital Downloads, Subscriptions, Donations, & Payments plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 4.9.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Successful execution requires the injected comment to be visible on a page that loads SureCart's web-component bundle (e.g. a page containing a SureCart Buy Button block), and the comment must be auto-approved or approved by a moderator.
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Analysis
by VulDB Data Team • 10/31/2026
The vulnerability identified in the SureCart plugin for WordPress, specifically affecting versions up to 4.9.4, represents a significant security risk classified as Stored Cross-Site Scripting (XSS). This flaw stems from insufficient input sanitization and output escaping mechanisms within the application code that handles user-generated content via the comment parameter. Unlike reflected XSS attacks where malicious scripts are executed immediately upon request injection, stored XSS involves persisting the malicious payload on the target server. In this specific context, attackers can inject arbitrary web scripts into comments associated with products or transactions managed by SureCart. The persistence of these payloads means that every time a legitimate user views a page containing an infected comment and loads the SureCart web-component bundle, such as a Buy Button block, the malicious script executes within their browser session. This creates a persistent threat vector where multiple users can be compromised simply by visiting specific product pages or transaction history screens that display these tainted comments.
From a technical perspective, the root cause lies in the failure to properly validate and escape user-supplied data before it is rendered in an HTML context. When a comment containing malicious JavaScript code is submitted through the plugin's interface, the system fails to strip out dangerous tags or encode special characters like less-than and greater-than signs. Consequently, when the page loads, the browser interprets these injected scripts as legitimate executable content rather than static text data. The requirement for the script to execute adds a layer of complexity for attackers; they must ensure that their payload is placed in a location where SureCart's web components are actively loaded. This typically involves targeting pages with interactive elements like purchase buttons, which necessitates some level of interaction or visibility from victims who browse these specific product areas. Furthermore, the attack chain requires either auto-approval settings to be enabled for comments or manual approval by an administrator, meaning that social engineering tactics may be necessary to convince moderators to approve malicious entries if strict moderation is in place.
The operational impact of this vulnerability extends beyond simple defacement or session hijacking. Successful exploitation allows unauthenticated attackers to steal sensitive user data such as cookies, session tokens, and potentially payment information displayed on the page. Attackers can also perform actions on behalf of authenticated users, including modifying account settings, initiating fraudulent transactions, or spreading malware by redirecting victims to malicious sites. This undermines the integrity and trustworthiness of the e-commerce platform, leading to potential financial losses for both merchants and customers. The presence of stored XSS in a plugin handling payments and subscriptions amplifies the severity because it targets users during critical interactions with the site. It also poses reputational damage risks as customer data breaches often result in regulatory scrutiny under standards like GDPR or PCI DSS if payment details are compromised.
To mitigate this vulnerability, immediate action is required to update the SureCart plugin to version 4.9.5 or later where these input validation and output escaping issues have been addressed by the developers. Administrators should also review existing comments for any suspicious content that may have been injected prior to the patch application. Implementing a Web Application Firewall (WAF) can provide an additional layer of defense by filtering out known malicious patterns in HTTP requests before they reach the application logic. Additionally, enabling strict Content Security Policy headers can help mitigate the impact of successful XSS attacks by restricting the sources from which scripts are allowed to load and execute. Regular security audits and code reviews focusing on input sanitization practices are recommended to prevent similar vulnerabilities in future updates or custom integrations within the WordPress ecosystem.