CVE-2025-31538 in Checklist Plugin
Summary
by MITRE • 03/31/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in checklistcom Checklist allows Stored XSS. This issue affects Checklist: from n/a through 1.1.9.
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Analysis
by VulDB Data Team • 03/31/2025
This vulnerability represents a critical cross-site scripting flaw in the checklistcom Checklist application that enables stored XSS attacks. The weakness occurs during the web page generation process where input data is not properly sanitized or escaped before being rendered back to users. This allows attackers to inject malicious scripts that persist in the application's database and execute whenever affected pages are loaded. The vulnerability affects all versions from the initial release through 1.1.9, indicating a long-standing issue that has not been adequately addressed. The stored nature of this XSS means that malicious payloads remain active even after the initial injection, making it particularly dangerous as victims encounter the exploit repeatedly. The flaw directly violates the principle of input validation and output encoding, which are fundamental security practices in web application development. According to CWE standards, this maps to CWE-79 which specifically addresses cross-site scripting vulnerabilities where user-controllable data is not properly escaped when embedded in web pages. The ATT&CK framework categorizes this under T1531 - Establish Persistence, as the stored nature of the vulnerability allows attackers to maintain access through persistent script execution. The impact extends beyond simple script execution as attackers can potentially steal session cookies, perform actions on behalf of users, redirect them to malicious sites, or extract sensitive information from the application's context. This vulnerability particularly affects users who have administrative privileges or access to sensitive data within the checklist application, as the XSS payload could be used to escalate privileges or gain unauthorized access to protected resources. The issue demonstrates a failure in the application's security architecture where input validation occurs too late in the processing pipeline, allowing potentially malicious content to be stored in the database and subsequently executed without proper sanitization. Organizations using this checklist application face significant risk of data breaches, privilege escalation, and potential complete system compromise if attackers exploit this vulnerability. The lack of version-specific mitigation information suggests that administrators should immediately upgrade to the latest available version or implement compensating controls. The vulnerability's presence across multiple versions indicates either inadequate security testing during development or insufficient patch management processes within the software lifecycle. Security teams should prioritize this vulnerability in their risk assessment and remediation planning, as stored XSS attacks can remain undetected for extended periods while continuously affecting users who access the vulnerable application. Organizations should implement comprehensive input validation and output encoding mechanisms, including the use of Content Security Policy headers, to prevent similar vulnerabilities from occurring in other web applications within their infrastructure.