{"id":"CVE-2026-93421","state":"PUBLISHED","title":"Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint","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.","publishedAt":"2026-09-23T18:59:52.637Z","updatedAt":"2026-09-23T19:41:34.966Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"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":"GitHub_M"},"assigner":"GitHub_M","products":["mesop-dev mesop"],"affected":[{"vendor":"mesop-dev","product":"mesop","versions":[{"version":"< 1.3.4","status":"affected"}]}],"references":["https://github.com/mesop-dev/mesop/security/advisories/GHSA-g7f6-rxc4-qhph","https://github.com/mesop-dev/mesop/pull/1397","https://github.com/mesop-dev/mesop/commit/f38c42a1d3eba246941ef8d7f645072d53c58785","https://github.com/mesop-dev/mesop/releases/tag/v1.3.4"],"weaknesses":["CWE-117","CWE-150"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93421.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93421","state":"PUBLISHED","datePublished":"2026-09-23T18:59:52.637Z","dateUpdated":"2026-09-23T19:41:34.966Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-17T20:57:18.984Z"},"containers":{"cna":{"title":"Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint","descriptions":[{"lang":"en","value":"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":[{"vendor":"mesop-dev","product":"mesop","versions":[{"version":"< 1.3.4","status":"affected"}]}],"references":[{"url":"https://github.com/mesop-dev/mesop/security/advisories/GHSA-g7f6-rxc4-qhph","name":"https://github.com/mesop-dev/mesop/security/advisories/GHSA-g7f6-rxc4-qhph","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/mesop-dev/mesop/pull/1397","name":"https://github.com/mesop-dev/mesop/pull/1397","tags":["x_refsource_MISC"]},{"url":"https://github.com/mesop-dev/mesop/commit/f38c42a1d3eba246941ef8d7f645072d53c58785","name":"https://github.com/mesop-dev/mesop/commit/f38c42a1d3eba246941ef8d7f645072d53c58785","tags":["x_refsource_MISC"]},{"url":"https://github.com/mesop-dev/mesop/releases/tag/v1.3.4","name":"https://github.com/mesop-dev/mesop/releases/tag/v1.3.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-117","lang":"en","description":"CWE-117: Improper Output Neutralization for Logs","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-150","lang":"en","description":"CWE-150: Improper Neutralization of Escape, Meta, or Control Sequences","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-23T18:59:52.637Z"},"source":{"advisory":"GHSA-g7f6-rxc4-qhph","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-23T19:25:37.624256Z","id":"CVE-2026-93421","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-23T19:41:34.966Z"}}]}}}