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CVE-2026-12209— RubyLouvre avalon Template Filter index.js prototype pollution

Quick assessment

Affected
RubyLouvre avalon
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.

avalon是rubylouvre个人开发者的一款前端开发框架。 RubyLouvre avalon 2.2.10及之前版本存在安全漏洞，该漏洞源于Template Filter Handler组件中src/filters/index.js文件的一个未知函数存在对象原型属性修改不当的问题，可能导致攻击者远程发起攻击。

CVSS 5.3 · Medium EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 11

VendorProduct Version RangeStatus
RubyLouvre avalon 2.2.0 affected
2.2.1 affected
2.2.2 affected
2.2.3 affected
2.2.4 affected
2.2.5 affected
2.2.6 affected
2.2.7 affected
… +3 more rows
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I. Basic Information for CVE-2026-12209

Vulnerability Information
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Vulnerability Title
RubyLouvre avalon Template Filter index.js prototype pollution
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in RubyLouvre avalon up to 2.2.10. The impacted element is an unknown function of the file src/filters/index.js of the component Template Filter Handler. Such manipulation leads to improperly controlled modification of object prototype attributes. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
rubylouvre avalon 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
avalon是rubylouvre个人开发者的一款前端开发框架。 RubyLouvre avalon 2.2.10及之前版本存在安全漏洞，该漏洞源于Template Filter Handler组件中src/filters/index.js文件的一个未知函数存在对象原型属性修改不当的问题，可能导致攻击者远程发起攻击。
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
RubyLouvre avalon 2.2.0 cpe:2.3:a:rubylouvre:avalon:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-12209

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-12209

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Proof of Concept for CVE-2026-12209 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1321