Vulnerability Description
Mesop is a Python-based UI framework that allows users to build web applications. Prior to 1.3.4, the unauthenticated /__csp__ endpoint passes attacker-controlled document-uri, blocked-uri, and violated-directive values to the csp_report handler in mesop/server/static_file_serving.py, which prints them to standard output without neutralizing terminal control sequences. When an operator views the resulting logs in an ANSI-capable terminal, injected ANSI or VT100 sequences can clear or reposition the display, hide text, or present forged messages, reducing the integrity of monitoring and incident-response output. This issue is fixed in version 1.3.4.
Related Weaknesses (CWE)
References
- https://github.com/mesop-dev/mesop/commit/f38c42a1d3eba246941ef8d7f645072d53c587
- https://github.com/mesop-dev/mesop/pull/1397
- https://github.com/mesop-dev/mesop/releases/tag/v1.3.4
- https://github.com/mesop-dev/mesop/security/advisories/GHSA-g7f6-rxc4-qhph
FAQ
What is CVE-2026-93421?
CVE-2026-93421 is a documented vulnerability. Mesop is a Python-based UI framework that allows users to build web applications. Prior to 1.3.4, the unauthenticated /__csp__ endpoint passes attacker-controlled document-uri, blocked-uri, and violat...
How severe is CVE-2026-93421?
CVSS scoring is not yet available for CVE-2026-93421. Check NVD for updates.
Is there a patch for CVE-2026-93421?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.