CVE-2026-93421— Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint
Quick assessment
Affected
mesop-dev mesop
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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/serve
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1041 · Exfiltration Over C2 Channel T1071 · Application Layer Protocol
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I. Basic Information for CVE-2026-93421
Vulnerability Information
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Vulnerability Title
Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
日志输出的转义处理不恰当
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-93421
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Other References for CVE-2026-93421 (4)
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🔗 Release v1.3.4 · mesop-dev/mesop · GitHub x_refsource_MISC
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IV. Related Vulnerabilities
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V. Comments for CVE-2026-93421
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