CVE-2024-37562 in Simple Post Notes Plugin
Summary
by MITRE • 07/20/2024
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in BracketSpace Simple Post Notes allows Stored XSS.This issue affects Simple Post Notes: from n/a through 1.7.7.
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Analysis
by VulDB Data Team • 03/17/2025
This vulnerability represents a critical cross-site scripting flaw in the BracketSpace Simple Post Notes plugin, specifically targeting the web page generation process where input validation and sanitization mechanisms fail to properly neutralize user-supplied data. The issue manifests as a stored XSS vulnerability, meaning malicious scripts can be permanently injected into the plugin's database and subsequently executed whenever affected pages are rendered to users. The vulnerability exists within the plugin's handling of user input during the creation and storage of post notes, where insufficient sanitization allows attackers to inject malicious payloads that persist across sessions.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script tags or other malicious code within the post notes functionality. When this input is stored in the database and later retrieved for display on web pages, the malicious code executes in the context of other users' browsers who view the affected content. This stored nature makes the vulnerability particularly dangerous as it can affect multiple users over extended periods without requiring repeated exploitation attempts. The vulnerability affects all versions of the Simple Post Notes plugin from the initial release through version 1.7.7, indicating a long-standing issue that has not been properly addressed.
From an operational perspective, this vulnerability exposes users to significant security risks including session hijacking, credential theft, and potential full system compromise through browser-based attacks. Attackers can leverage this vulnerability to execute arbitrary JavaScript code in victims' browsers, potentially stealing cookies, modifying content, redirecting users to malicious sites, or performing actions on behalf of authenticated users. The impact extends beyond simple data theft as the stored nature of the vulnerability means that malicious payloads can persist for extended periods, allowing for prolonged attack windows. This vulnerability directly maps to CWE-79 which describes improper neutralization of input during web page generation, and aligns with ATT&CK technique T1531 which covers "Modify Existing Service" and T1566 which covers "Phishing" through the exploitation of web application vulnerabilities.
Mitigation strategies should focus on immediate plugin updates to versions that address the XSS vulnerability, implementing proper input sanitization and output encoding mechanisms, and deploying web application firewalls to detect and block malicious payloads. Organizations should also consider implementing content security policies to prevent execution of unauthorized scripts, conduct thorough security testing of all user input handling mechanisms, and establish monitoring procedures to detect potential exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation and output encoding in web applications, particularly in plugins that handle user-generated content, and serves as a reminder of the need for comprehensive security testing throughout the software development lifecycle.