{"id":"CVE-2026-53597","revision":"7274d14ad99540c18a3e5c93f934d5f2","records":[{"revision":"7274d14ad99540c18a3e5c93f934d5f2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53597","aliases":[],"title":"Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader","description":"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.","state":0,"publishedAt":"2026-07-16T14:54:55.075+00:00","modifiedAt":"2026-07-18T02:51:03.9+00:00","affected":[{"ecosystem":"Vendor product","name":"prompty","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"microsoft\",\n                    \"product\": \"prompty\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.0.0-alpha.1, < 2.0.0-beta.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/microsoft/prompty/security/advisories/GHSA-c4gh-rv8h-q9vw","https://github.com/microsoft/prompty/commit/c27402da2487075be577f06aa79df627fb9d6853"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53597","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53597","identifiers":["CVE-2026-53597"]},"retained":false,"historicalAffected":[]}],"coverage":[]}