CVE-2026-15034: Flask-MonitoringDashboard CSRF Vulnerability (v5.0.2)

Technical summary

CVE-2026-15034 is a CSRF vulnerability in Flask-MonitoringDashboard affecting versions up to 5.0.2. The vulnerability stems from insufficient request validation or missing anti-CSRF tokens in unspecified functionality. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N) reflects a network-accessible vulnerability with low attack complexity that requires user interaction but results in limited integrity impact. The CWE classifications (CWE-352: Cross-Site Request Forgery, CWE-862: Missing Authorization) indicate the root causes involve both missing CSRF protections and potential authorization flaws.

Business impact

CSRF vulnerabilities in monitoring dashboards can allow unauthorized state changes—modifying alerting rules, disabling monitoring, or altering dashboard configurations. If your organization uses Flask-MonitoringDashboard to track critical infrastructure or application health, an attacker could silently disable alerts or change thresholds, delaying detection of real incidents. The impact is primarily to data integrity and operational visibility rather than confidentiality.

Affected systems

Flask-MonitoringDashboard versions up to and including 5.0.2 are vulnerable. Flask-MonitoringDashboard is a Flask extension used for real-time application performance monitoring and dashboard functionality. Organizations should identify all instances where this library is deployed, particularly in production monitoring stacks or internal management interfaces.

Exploitability

Exploitability is moderate. The attack is remotely deliverable over the network and requires no elevated privileges, but does require the victim to click a link or visit a malicious page while authenticated to the dashboard. Public disclosure is confirmed, and exploit techniques are available, increasing the likelihood of opportunistic attacks against unpatched instances. However, the requirement for user interaction and authentication reduces the attack surface compared to unauthenticated or wormable CSRF issues.

Remediation

Upgrade Flask-MonitoringDashboard to a patched version released by the project. Verify against the official project repository or vendor advisory for the specific patched version number. As an interim measure, implement network-level access controls to restrict who can reach the dashboard interface, and consider deploying a Web Application Firewall (WAF) with CSRF detection rules. Additionally, ensure anti-CSRF tokens are properly enforced across all dashboard endpoints.

Patch guidance

Check the Flask-MonitoringDashboard GitHub repository or official release notes for a patched version released after July 8, 2026. Apply the patch to all instances in your environment. Since the vendor has not yet publicly released a response despite early notification, monitor the project closely for updates. If no patch is available within a reasonable timeframe, implement compensating controls such as IP whitelisting, VPN-only access to the dashboard, or disabling the dashboard in non-critical environments pending a fix.

Detection guidance

Monitor web application logs for anomalous POST or state-changing requests originating from unexpected referrers or lacking proper CSRF tokens. Look for requests to the Flask-MonitoringDashboard that modify configuration, alerting rules, or thresholds. Implement HTTP referer header validation and log violations. Use browser-based security headers (SameSite cookies) in your Flask-MonitoringDashboard configuration to add an additional layer of CSRF protection. Review application logs for suspicious cross-origin requests or unusual administrative actions during times when those users were not actively interacting with the dashboard.

Why prioritize this

This vulnerability merits prompt but not emergency remediation. The CVSS score of 4.3 (MEDIUM) and lack of KEV listing reflect the requirement for user interaction and limited confidentiality impact. However, public disclosure and the availability of exploit details increase risk. Prioritize patching or applying compensating controls if Flask-MonitoringDashboard is internet-facing or accessible to untrusted users. If the dashboard is behind strong network controls and accessed only by your team internally, the practical risk is lower but still warrants timely remediation.

Risk score, explained

The CVSS 4.3 MEDIUM score reflects a network-accessible vulnerability with low complexity but requiring user interaction (UI:R) and resulting only in integrity impact (I:L) with no confidentiality or availability loss. The attack vector is unauthenticated but exploiting it effectively requires tricking an already-authenticated user into visiting an attacker-controlled page. The lack of KEV listing indicates no evidence of active, weaponized exploitation in the wild at time of publication, though public disclosure increases this risk over time.

Frequently asked questions