CVE-2026-44364 Overview
CVE-2026-44364 is a Cross-Site Request Forgery (CSRF) vulnerability affecting MISP Modules version 3.0.7 and earlier. MISP Modules are autonomous components used to extend the Malware Information Sharing Platform (MISP) with additional services. The home blueprint of the MISP Modules website was exempted from CSRF protection, allowing attackers to coerce authenticated users into submitting unintended requests to the home endpoint. Successful exploitation enables modification of session query data in the context of the authenticated user. The maintainers fixed the issue by enabling CSRF protection for the affected blueprint and hardening query parsing logic.
Critical Impact
Attackers can manipulate authenticated session query data by tricking authenticated MISP Modules users into visiting malicious content, compromising confidentiality and integrity of the user's session context.
Affected Products
- MISP Modules version 3.0.7 and earlier
- MISP deployments leveraging the modules home blueprint
- Authenticated user sessions interacting with the MISP Modules web interface
Discovery Timeline
- 2026-05-13 - CVE-2026-44364 published to NVD
- 2026-05-13 - Last updated in NVD database
Technical Details for CVE-2026-44364
Vulnerability Analysis
The vulnerability is classified as [CWE-352] Cross-Site Request Forgery. The MISP Modules web application defines a home blueprint that handles requests to the home endpoint. This blueprint was explicitly exempted from the application-wide CSRF protection mechanism. As a result, requests to the endpoint did not require a valid anti-CSRF token tied to the user's session.
An attacker can host malicious content that triggers cross-origin requests to a MISP Modules deployment. When an authenticated user loads that content, the browser automatically attaches session cookies to the forged request. The server processes the request as if the user initiated it. Because the home endpoint accepts query parameters that influence session-stored state, the attacker can modify session query data without the user's knowledge or consent.
Root Cause
The root cause is the explicit CSRF exemption applied to the home blueprint within the MISP Modules Flask application. Additionally, query parsing on this endpoint did not enforce strict validation, allowing arbitrary parameter values to be persisted into the authenticated session.
Attack Vector
Exploitation requires an authenticated MISP Modules user to interact with attacker-controlled content, such as a crafted webpage or email containing an embedded request. No direct authentication credentials are needed by the attacker. The forged request executes in the victim's session context over the network, satisfying the user interaction requirement noted in the CVSS vector. See the GitHub Security Advisory GHSA-j4rh-7jcr-qm69 for the maintainer's technical analysis.
Detection Methods for CVE-2026-44364
Indicators of Compromise
- Unexpected modifications to session query state for authenticated MISP Modules users without corresponding user-driven navigation events.
- HTTP requests to the MISP Modules home endpoint originating with Referer or Origin headers from external, untrusted domains.
- Requests to the home endpoint lacking a valid CSRF token while the application is running version 3.0.7 or earlier.
Detection Strategies
- Inspect web server access logs for cross-origin POST or GET requests targeting the MISP Modules home route.
- Correlate authenticated session activity with browser referrer data to identify requests sourced from external domains.
- Audit MISP Modules deployments for the installed version using package metadata and flag instances at or below 3.0.7.
Monitoring Recommendations
- Enable verbose request logging on the MISP Modules web service, capturing Origin, Referer, and authentication context per request.
- Forward web application logs to a centralized analytics platform to detect anomalous query parameter changes against historical baselines.
- Alert on any access to the home endpoint from external referrers, especially during off-hours or from atypical client IP ranges.
How to Mitigate CVE-2026-44364
Immediate Actions Required
- Upgrade MISP Modules to a version later than 3.0.7 that includes the CSRF protection fix for the home blueprint.
- Force re-authentication of active sessions to invalidate any query state that may have been tampered with prior to patching.
- Review user activity logs since the deployment of vulnerable versions to identify suspicious cross-origin interactions.
Patch Information
The MISP project addressed CVE-2026-44364 by removing the CSRF exemption on the home blueprint and hardening query parsing within the affected handler. Patch details are documented in the MISP Modules Security Advisory GHSA-j4rh-7jcr-qm69. Operators should pull the fixed release from the official MISP Modules repository and redeploy.
Workarounds
- Restrict access to the MISP Modules web interface to trusted internal networks or via VPN until patching is complete.
- Enforce SameSite=Strict or SameSite=Lax attributes on session cookies to limit cross-origin cookie transmission.
- Deploy a web application firewall rule that rejects requests to the home endpoint lacking a same-origin Referer header.
# Configuration example: upgrade MISP Modules to the patched release
pip install --upgrade misp-modules
systemctl restart misp-modules
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
