CVE-2020-19286 in Jeesns
Summary
by MITRE • 09/10/2021
A stored cross-site scripting (XSS) vulnerability in the /question/detail component of Jeesns 1.4.2 allows attackers to execute arbitrary web scripts or HTML via a crafted payload in the source field of the editor.
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Analysis
by VulDB Data Team • 09/12/2021
The vulnerability CVE-2020-19286 represents a critical stored cross-site scripting flaw within the Jeesns 1.4.2 web application framework. This vulnerability specifically targets the /question/detail component where user input is processed and stored without adequate sanitization. The attack vector occurs when malicious actors craft specially designed payloads and inject them into the source field of the editor, which then gets stored in the application's database. When other users access the affected question detail page, their browsers execute the malicious scripts contained within the stored payload, creating a persistent threat that can affect multiple victims over time.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the application's data processing pipeline. The source field in the editor component fails to properly sanitize user-provided content, allowing HTML and JavaScript code to be stored directly in the database. This stored content is then rendered without proper context-aware escaping, creating the conditions for XSS exploitation. The vulnerability manifests as a stored XSS attack because the malicious payload persists in the application's backend storage and executes automatically when accessed by other users, distinguishing it from reflected XSS variants that require direct user interaction with crafted URLs.
From an operational impact perspective, this vulnerability presents significant risks to both application integrity and user security. Attackers can leverage this flaw to steal session cookies, perform unauthorized actions on behalf of victims, redirect users to malicious sites, or extract sensitive information from authenticated sessions. The persistent nature of stored XSS means that the attack remains active until the malicious content is removed from the database, potentially affecting numerous users over extended periods. Organizations using Jeesns 1.4.2 may experience data breaches, unauthorized access to user accounts, and potential compromise of the entire application infrastructure through session hijacking or privilege escalation attacks.
Security mitigations for CVE-2020-19286 should focus on implementing comprehensive input sanitization and output encoding mechanisms throughout the application's data flow. The recommended approach includes implementing strict content validation for all user-provided input, particularly in fields that support rich text or HTML content. Organizations should deploy proper HTML escaping routines before rendering any user-generated content, ensuring that potentially dangerous characters are properly encoded. Additionally, implementing a Content Security Policy (CSP) header can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be executed. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and represents a clear violation of the principle of least privilege and input validation as outlined in the OWASP Top Ten security standards. Organizations should also consider implementing web application firewalls and regular security scanning to detect and prevent exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1203 - Exploitation for Client Execution, highlighting the importance of protecting application components that handle user input to prevent malicious script execution in victim browsers.