CVE-2026-0824 Overview
A Cross-Site Scripting (XSS) vulnerability has been discovered in the QuestDB UI Web Console affecting versions up to 1.11.9. This security flaw exists within an unknown function of the Web Console component, where improper input handling allows attackers to inject and execute arbitrary scripts in users' browsers. The vulnerability can be exploited remotely, and a public exploit has been released, increasing the risk of active attacks against unpatched systems.
Critical Impact
Attackers can execute malicious scripts in the context of authenticated users accessing the QuestDB Web Console, potentially leading to session hijacking, data theft, or unauthorized actions within the database management interface.
Affected Products
- QuestDB UI versions up to 1.11.9
- QuestDB installations utilizing the vulnerable Web Console component
- Systems running QuestDB versions prior to 9.3.0
Discovery Timeline
- 2026-01-10 - CVE CVE-2026-0824 published to NVD
- 2026-01-13 - Last updated in NVD database
Technical Details for CVE-2026-0824
Vulnerability Analysis
This Cross-Site Scripting vulnerability (CWE-79) resides in the QuestDB Web Console component. The flaw stems from inadequate sanitization of user-supplied input, which is subsequently rendered in the browser without proper encoding or validation. When exploited, an attacker can inject malicious JavaScript code that executes within the security context of users interacting with the Web Console.
The vulnerability requires user interaction—a victim must be tricked into visiting a malicious link or page that triggers the XSS payload. Given that QuestDB is a high-performance time-series database often used for analytics and monitoring, compromising the Web Console could grant attackers access to sensitive operational data or allow them to manipulate database queries.
Root Cause
The root cause of this vulnerability is insufficient input validation and output encoding within the Web Console's rendering logic. User-controllable data is processed without adequate sanitization, allowing script content to be interpreted as executable code by the browser rather than being treated as inert text data.
Attack Vector
The attack is network-based and can be executed remotely. An attacker crafts a malicious URL or input containing JavaScript payloads targeting the vulnerable Web Console function. When an authenticated user accesses the compromised resource, the injected script executes in their browser session.
The exploitation chain typically involves:
- Attacker identifies the vulnerable input vector in the QuestDB Web Console
- Malicious script payload is crafted and embedded in a URL or input field
- Victim user is socially engineered to access the malicious resource
- The payload executes in the victim's browser, potentially exfiltrating session tokens or performing actions on behalf of the user
Technical details regarding the specific exploitation mechanism can be found in the GitHub XSS Vulnerability Report.
Detection Methods for CVE-2026-0824
Indicators of Compromise
- Unusual JavaScript execution patterns in QuestDB Web Console access logs
- Suspicious URL parameters containing encoded script tags or event handlers
- Unexpected network connections originating from the Web Console interface
- Session token exfiltration attempts in network traffic
Detection Strategies
- Deploy Web Application Firewall (WAF) rules to detect and block XSS payloads targeting QuestDB endpoints
- Monitor HTTP request logs for common XSS patterns including <script>, javascript:, and event handler attributes
- Implement Content Security Policy (CSP) headers to restrict inline script execution and alert on violations
- Utilize browser-based XSS auditing tools and security extensions for detection
Monitoring Recommendations
- Enable detailed logging on the QuestDB Web Console to capture all user input and request parameters
- Configure SIEM alerts for suspicious patterns in web application logs associated with XSS attack signatures
- Monitor for abnormal session activity that may indicate compromised user accounts
- Review network traffic for data exfiltration attempts following suspicious Web Console interactions
How to Mitigate CVE-2026-0824
Immediate Actions Required
- Upgrade QuestDB UI to version 1.1.10 or later, which contains the security patch
- Update to QuestDB version 9.3.0 which includes the fix as confirmed by the vendor
- Implement Content Security Policy headers to mitigate XSS impact until patching is complete
- Review Web Console access logs for evidence of exploitation attempts
Patch Information
The vulnerability has been addressed in the QuestDB codebase. The fix is identified by commit hash b42fd9f18476d844ae181a10a249e003dafb823d. The vendor has confirmed that the fix is included in QuestDB 9.3.0. Organizations should upgrade the affected UI component to version 1.1.10 or update to QuestDB 9.3.0 to fully remediate this vulnerability.
Relevant patch resources:
Workarounds
- Restrict network access to the QuestDB Web Console to trusted IP addresses only
- Implement a reverse proxy with XSS filtering capabilities in front of the Web Console
- Deploy Content Security Policy headers with strict script-src directives to limit script execution
- Educate users to avoid clicking suspicious links while authenticated to the Web Console
# Example nginx configuration to add CSP headers
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; object-src 'none';" always;
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
