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CVE-2026-53597— Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader

Quick assessment

Affected
microsoft prompty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft prompty是美国Microsoft公司的一款提示词工作流管理工具。 Microsoft prompty 2.0.0-alpha.1版本至2.0.0-beta.3之前版本存在代码注入漏洞，该漏洞源于@prompty/core TypeScript加载器未覆盖可执行的js和javascript frontmatter引擎，允许攻击者控制的.prompty文件通过---js frontmatter在提示加载期间执行任意JavaScript代码。

AI Predicted 8.1 Difficulty: Easy EPSS 0.97% · P60

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
microsoft prompty >= 2.0.0-alpha.1, < 2.0.0-beta.3 affected
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I. Basic Information for CVE-2026-53597

Vulnerability Information
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Vulnerability Title
Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft prompty 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft prompty是美国Microsoft公司的一款提示词工作流管理工具。 Microsoft prompty 2.0.0-alpha.1版本至2.0.0-beta.3之前版本存在代码注入漏洞，该漏洞源于@prompty/core TypeScript加载器未覆盖可执行的js和javascript frontmatter引擎，允许攻击者控制的.prompty文件通过---js frontmatter在提示加载期间执行任意JavaScript代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
microsoft prompty >= 2.0.0-alpha.1, < 2.0.0-beta.3 -

II. Public POCs for CVE-2026-53597

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III. Intelligence Information for CVE-2026-53597

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Patches & Fixes for CVE-2026-53597 (1)

Vendor Advisories for CVE-2026-53597 (1)

Same Patch Batch · microsoft · 2026-07-16 · 20 CVEs total

CVE-2026-59866 9.3 CRITICAL Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clien
CVE-2026-59864 9.3 CRITICAL Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
CVE-2026-59865 9.3 CRITICAL Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota i
CVE-2026-59860 8.7 HIGH Kiota: XML Doc-Comment Newline Breakout Code Injection
CVE-2026-59859 8.7 HIGH Kiota: Code Generation Literal Injection in the PHP Generator
CVE-2026-57206 8.6 HIGH SimpleChat plugin validation endpoints missing authentication and authorization
CVE-2026-59117 7.5 HIGH Windows Terminal Remote Code Execution Vulnerability
CVE-2026-59861 7.5 HIGH Kiota: Code Generation Literal Injection in Kiota Ruby Generator
CVE-2026-59862 7.5 HIGH Kiota: Code Generation Literal Injection in the Python Generator
CVE-2026-53598 7.5 HIGH Prompty: Arbitrary File Read via ${file:path} Reference Expansion
CVE-2026-59867 7.1 HIGH Kiota: Generation-time SSRF + remote/local file inclusion via unrestricted $ref
CVE-2026-58598 7.0 HIGH Windows Backup Service Elevation of Privilege Vulnerability
CVE-2026-59863 7.0 HIGH Kiota: Workspace-config poisoning: out-of-repo file write + generation-time SSRF
CVE-2026-55440 6.5 MEDIUM Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated se
CVE-2026-58643 6.1 MEDIUM Windows Admin Center Spoofing Vulnerability
CVE-2026-62826 4.6 MEDIUM Microsoft SharePoint Server Spoofing Vulnerability
CVE-2026-57205 4.3 MEDIUM SimpleChat: Authenticated users can access other users' profile metadata through user IDOR
CVE-2026-54568 4.3 MEDIUM Microsoft UFO: Missing Authorization in DEVICE_INFO_REQUEST Allows a DEVICE Client to Read
CVE-2026-54733 moodle-local_o365: Authentication bypass via unverified JWT signature in Teams SSO endpoin

IV. Related Vulnerabilities

Same product: prompty
Same vendor: microsoft
Same weakness: CWE-94

V. Comments for CVE-2026-53597

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