CVE-2026-44267— Elo: Sandbox escape to arbitrary Node.js / browser code execution via unfiltered `.constructor` member access in Elo JavaScript emitter
Quick assessment
Affected
enspirit elo
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.
Elo 是一种专为无代码工具设计的纯函数式表达式语言。在 1.0.1 版本之前，若将普通 Elo 字符串传递给 、 或 ，攻击者可通过 访问 JavaScript 的 构造函数。其根本原因在于： 中的 处理器未拒绝元属性（meta-properties）， 将存活属性直接输出为代码，而 将 视为普通标识符接受。由此生成的 JavaScript 代码会在宿主运行时执行攻击者指定的任意代码。这可能导致浏览器脚本执行和自动运行沙盒中的会话劫持，以及在库、持续集成（CI）或 DevOps 主机上执行任意 Node.js 代
Possible ATT&CK Techniques 3 AI
T1059.006 · Python T1059.007 · JavaScript T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-44267
Vulnerability Information
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Vulnerability Title
Elo: Sandbox escape to arbitrary Node.js / browser code execution via unfiltered `.constructor` member access in Elo JavaScript emitter
Source: CVE Program / CVE List V5
Vulnerability Description
Elo is a purely functional expression language for no-code tools. Prior to 1.0.1, plain Elo strings supplied to defaultFormats.elo.parse(), bin/elo, or elo-lang.org/try can use .constructor.constructor to reach JavaScript Function because the member_access handler in src/transform.ts does not reject meta-properties, src/compilers/javascript.ts emits the surviving property directly, and src/parser.ts accepts constructor as an ordinary identifier. The resulting generated JavaScript executes attacker-selected code in the host runtime. This permits browser script execution and session compromise on the auto-running playground and arbitrary Node.js code execution on library, CI, or DevOps hosts. This plain-string path is distinct from the programmatic AST-object injection issue. This issue is fixed in version 1.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-44267
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Other References for CVE-2026-44267 (3)
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https://github.com/enspirit/elo/security/advisories/GHSA-33r5-xmm8-v6x5 x_refsource_CONFIRM
Same Patch Batch · enspirit · 2026-11-03 · 3 CVEs total
| CVE-2026-44266 | 9.8 CRITICAL | Elo: Remote Code Execution in Elo Ruby backend via unescaped `#{...}` interpolation in emi |
| CVE-2026-44265 | 7.4 HIGH | Elo: Code injection in Elo backends via unvalidated emission of programmatic AST fields |