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CVE-2026-42205— Avo: Broken Access Control: Unauthorized Execution of Arbitrary Action Classes Across Resources

Quick assessment

Affected
avo-hq avo
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.

Avo是Avo开源的一个开源的 ruby on rails 管理面板创建框架。 Avo 3.31.2之前版本存在访问控制错误漏洞，该漏洞源于ActionsController中不安全的操作查找逻辑，可能导致认证用户在任何资源上执行任何操作类，即使该操作未注册到该特定资源，导致权限提升和整个应用程序中的未经授权数据操作。

CVSS 8.8 · High EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
avo-hq avo < 3.31.2 affected
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I. Basic Information for CVE-2026-42205

Vulnerability Information
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Vulnerability Title
Avo: Broken Access Control: Unauthorized Execution of Arbitrary Action Classes Across Resources
Source: CVE Program / CVE List V5
Vulnerability Description
Avo is a framework to create admin panels for Ruby on Rails apps. Prior to version 3.31.2, a broken access control vulnerability was identified in the ActionsController of the Avo framework. Due to insecure action lookup logic, an authenticated user can execute any Action class (descendants of Avo::BaseAction) on any resource, even if the action is not registered for that specific resource. This leads to Privilege Escalation and unauthorized data manipulation across the entire application. This issue has been patched in version 3.31.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Avo 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avo是Avo开源的一个开源的 ruby on rails 管理面板创建框架。 Avo 3.31.2之前版本存在访问控制错误漏洞，该漏洞源于ActionsController中不安全的操作查找逻辑，可能导致认证用户在任何资源上执行任何操作类，即使该操作未注册到该特定资源，导致权限提升和整个应用程序中的未经授权数据操作。
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
avo-hq avo < 3.31.2 -

II. Public POCs for CVE-2026-42205

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8359 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-42205

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Vendor Advisories for CVE-2026-42205 (1)

Vendor Pages for CVE-2026-42205 (1)

IV. Related Vulnerabilities

Same product: avo
Same vendor: avo-hq
Same weakness: CWE-284

V. Comments for CVE-2026-42205

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