CVE-2026-53597

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{"affected": [{"affectedData": [{"product": "prompty", "vendor": "microsoft", "versions": [{"status": "affected", "version": ">= 2.0.0-alpha.1, < 2.0.0-beta.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Prompty is a markdown file format (.prompty) for LLM prompts. From 2.0.0-alpha.1 until 2.0.0-beta.3, the @prompty/core TypeScript loader in runtime/typescript/packages/core/src/core/loader.ts used gray-matter without overriding executable js and javascript frontmatter engines, allowing an attacker-controlled .prompty file with ---js frontmatter to execute arbitrary JavaScript during prompt loading. This issue is fixed in version 2.0.0-beta.3."}, {"lang": "es", "value": "Prompty es un formato de archivo markdown (.prompty) para prompts de LLM. Desde la 2.0.0-alpha.1 hasta la 2.0.0-beta.3, el cargador TypeScript @prompty/core en runtime/typescript/packages/core/src/core/loader.ts utilizaba gray-matter sin anular los motores de frontmatter ejecutables js y javascript, lo que permit\u00eda que un archivo .prompty controlado por un atacante con frontmatter ---js ejecutara JavaScript arbitrario durante la carga del prompt. Este problema se solucion\u00f3 en la versi\u00f3n 2.0.0-beta.3."}], "id": "CVE-2026-53597", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53597", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-18T02:50:54.007782Z", "version": "2.0.3"}}]}, "published": "2026-07-16T16:19:12.860", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/microsoft/prompty/commit/c27402da2487075be577f06aa79df627fb9d6853"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/prompty/security/advisories/GHSA-c4gh-rv8h-q9vw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0-alpha.1,2.0.0-beta.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "product": "prompty", "vendor": "microsoft"}], "created": "2026-07-17T04:00:06.742974+00:00", "updated": "2026-07-31T02:00:05.501081+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$prompty"]}