CVE-2026-53597: Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader
microsoft · prompty
Affected: microsoft prompty · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 62% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- microsoft · prompty>= 2.0.0-alpha.1, < 2.0.0-beta.3
On the Atlas
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CoverageNo articles yet
No CyberSIXT article names CVE-2026-53597 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.