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CVE-2026-73299— Prompty: Server-Side Template Injection to Remote Code Execution in the @prompty/core Nunjucks Renderer

Quick assessment

Affected
microsoft prompty
Exploitation
Public or AI PoC available; prioritize validation
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 0.1.5之前版本和2.0.0-beta.5之前版本存在代码注入漏洞，该漏洞可能导致攻击者通过遍历constructor和prototype属性在宿主Node.js进程中执行JavaScript。

CVSS 10.0 · Critical EPSS 1.78% · P77

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
microsoft prompty < 0.1.5 affected
>= 2.0.0-alpha.1, < 2.0.0-beta.5 affected
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I. Basic Information for CVE-2026-73299

Vulnerability Information
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Vulnerability Title
Prompty: Server-Side Template Injection to Remote Code Execution in the @prompty/core Nunjucks Renderer
Source: CVE Program / CVE List V5
Vulnerability Description
Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process. This issue is fixed in versions 0.1.5 and 2.0.0-beta.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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 0.1.5之前版本和2.0.0-beta.5之前版本存在代码注入漏洞，该漏洞可能导致攻击者通过遍历constructor和prototype属性在宿主Node.js进程中执行JavaScript。
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 < 0.1.5 -

II. Public POCs for CVE-2026-73299

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6933 chars
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III. Intelligence Information for CVE-2026-73299

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Patches & Fixes for CVE-2026-73299 (4)

Vendor Advisories for CVE-2026-73299 (1)

Other References for CVE-2026-73299 (1)

Same Patch Batch · microsoft · 2026-08-12 · 4 CVEs total

CVE-2026-73296 9.4 CRITICAL Microsoft UFO: Unauthenticated Mobile MCP access allows remote Android device control and
CVE-2026-73298 8.7 HIGH Microsoft Container Migration Solution Accelerator: Authenticated IDOR allowing read/write
CVE-2026-73297 6.9 MEDIUM Microsoft UFO: IPv6 transition address bypass of SSRF guard in URL validation

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-73299

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