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CVE-2026-53769— Avo: Direct attachment upload endpoint lacks upload authorization and bypasses field-level upload policy

Quick assessment

Affected
avo-hq avo
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.

Avo是Avo公司的一个高度定制化的 Ruby on Rails 管理面板框架、内容管理系统和内部工具构建器。 Avo 2.28.0版本至3.32.0之前版本存在授权问题漏洞，该漏洞源于附件上传端点缺乏服务端上传授权并绕过字段级上传策略，可能导致经过身份验证的用户替换或添加附件内容。

CVSS 6.5 · Medium EPSS 0.42% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
avo-hq avo >= 2.28.0, < 3.32.0 affected
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I. Basic Information for CVE-2026-53769

Vulnerability Information
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Vulnerability Title
Avo: Direct attachment upload endpoint lacks upload authorization and bypasses field-level upload policy
Source: CVE Program / CVE List V5
Vulnerability Description
Avo is a framework to create admin panels for Ruby on Rails apps. From version 2.28.0 to before version 3.32.0, Avo's direct attachment upload endpoint lacks server-side upload authorization and bypasses the documented field-level upload policy methods such as upload_{FIELD_ID}?. An authenticated Avo user who can reach the Avo attachment upload endpoint can replace or add attachment content, including binary content, filename, and content-type metadata, on a resolved record even when both update? and upload_<field>? policies deny the operation. This primarily affects multi-role Avo Pro/Advanced-style deployments where non-administrator or restricted operator users can reach Avo and per-record or per-field operations are expected to be enforced by policies. This issue has been patched in version 3.32.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Avo 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avo是Avo公司的一个高度定制化的 Ruby on Rails 管理面板框架、内容管理系统和内部工具构建器。 Avo 2.28.0版本至3.32.0之前版本存在授权问题漏洞，该漏洞源于附件上传端点缺乏服务端上传授权并绕过字段级上传策略，可能导致经过身份验证的用户替换或添加附件内容。
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 >= 2.28.0, < 3.32.0 -

II. Public POCs for CVE-2026-53769

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III. Intelligence Information for CVE-2026-53769

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Patches & Fixes for CVE-2026-53769 (2)

Vendor Advisories for CVE-2026-53769 (1)

Vendor Pages for CVE-2026-53769 (1)

IV. Related Vulnerabilities

Same product: avo
Same vendor: avo-hq
Same weakness: CWE-862

V. Comments for CVE-2026-53769

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