CVE-2026-93421: Mesop-Dev Mesop

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mesop-Dev Mesop: before 1.3.4 (fixed in 1.3.4)

Published 2026-09-23. Last modified 2026-09-30.