23 Oct 2026 15:48:27 UTC
Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint
cve-program · CVE-2026-93421 · Published
CVE-2026-93421
Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint
CVSS 4.0 5.3 MEDIUMCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-93421
PublishedMesop 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.
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