mesop-dev Mesop up to 1.3.3 CSP Report static_file_serving.py csp_report handler document-uri/blocked-uri/violated-directive neutralization for logs

Summaryinfo

A vulnerability identified as problematic has been detected in mesop-dev Mesop up to 1.3.3. Impacted is the function csp_report handler of the file mesop/server/static_file_serving.py of the component CSP Report. This manipulation of the argument document-uri/blocked-uri/violated-directive causes neutralization for logs. This vulnerability is tracked as CVE-2026-93421. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in mesop-dev Mesop up to 1.3.3 and classified as problematic. Affected by this vulnerability is the function csp_report handler of the file mesop/server/static_file_serving.py of the component CSP Report. The manipulation of the argument document-uri/blocked-uri/violated-directive with an unknown input leads to a neutralization for logs vulnerability. The CWE definition for the vulnerability is CWE-117. The product does not neutralize or incorrectly neutralizes output that is written to logs. As an impact it is known to affect integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-93421 since 09/17/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 1.3.4 eliminates this vulnerability.

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Productinfo

Vendor

• mesop-dev

Name

• Mesop

Version

• 1.3.0
• 1.3.1
• 1.3.2
• 1.3.3

Website

• Product: https://github.com/mesop-dev/mesop/

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