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CVE-2026-55518— Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation

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-hq avo是avo-hq的根据输入中"category1_names":"其他服务器产品"和"category2_names":"服务器",确认产品为服务器产品,但具体类型不够明确,无法输出更具体的定义短语。 avo-hq avo 3.32.1之前版本和4.0.0.beta.51之前版本存在授权问题漏洞，该漏洞源于关联附加工作流中授权检查不一致，可能导致已认证的低权限用户绕过隐藏或禁用的附加控件，通过特制POST请求直接附加相关记录，从而导致权限提升和跨租户数据泄露。

CVSS 9.6 · Critical EPSS 0.45% · P37

Affected Version Matrix 2

VendorProduct Version RangeStatus
avo-hq avo >= 4.0.0.beta.1, < 4.0.0.beta.51 affected
< 3.32.1 affected
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I. Basic Information for CVE-2026-55518

Vulnerability Information
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Vulnerability Title
Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation
Source: CVE Program / CVE List V5
Vulnerability Description
Avo is a framework to create admin panels for Ruby on Rails apps. Prior to 3.32.1 and 4.0.0.beta.51, Avo's association attach workflow checks attach_<association>? in the UI and GET /resources/:resource/:id/:related/new path, but the actual write endpoint, POST /resources/:resource/:id/:related, does not run the same authorization check before mutating the association through Avo::AssociationsController#create. An authenticated low-privileged Avo user can bypass hidden or disabled attach controls and directly attach related records to a parent record by sending a crafted POST request, which can lead to privilege escalation and cross-tenant data exposure where associations represent authorization-bearing relationships. This issue is fixed in versions 3.32.1 and 4.0.0.beta.51.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
avo-hq avo 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
avo-hq avo是avo-hq的根据输入中"category1_names":"其他服务器产品"和"category2_names":"服务器",确认产品为服务器产品,但具体类型不够明确,无法输出更具体的定义短语。 avo-hq avo 3.32.1之前版本和4.0.0.beta.51之前版本存在授权问题漏洞，该漏洞源于关联附加工作流中授权检查不一致，可能导致已认证的低权限用户绕过隐藏或禁用的附加控件，通过特制POST请求直接附加相关记录，从而导致权限提升和跨租户数据泄露。
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 >= 4.0.0.beta.1, < 4.0.0.beta.51 -

II. Public POCs for CVE-2026-55518

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7486 chars
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III. Intelligence Information for CVE-2026-55518

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Patches & Fixes for CVE-2026-55518 (2)

Vendor Advisories for CVE-2026-55518 (1)

Vendor Pages for CVE-2026-55518 (1)

IV. Related Vulnerabilities

Same product: avo
Same vendor: avo-hq
Same weakness: CWE-639

V. Comments for CVE-2026-55518

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