CVE-2026-93421
Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint
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.
| CWE | CWE-117 CWE-150 |
| Vendor | mesop-dev |
| Product | mesop |
| Published | Sep 23, 2026 |
| Last Updated | Sep 23, 2026 |
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