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CVE-2026-56309— Capgo - Plan Bypass via Unrestricted Attachment Upload Endpoint

Quick assessment

Affected
Capgo Capgo
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.

Capgo是CAPGO公司的一个专为CapacitorJS开发者打造的移动应用开发和更新平台。 Capgo 12.128.2之前版本存在资源管理错误漏洞，该漏洞源于未对/files/upload/attachments端点执行计划/配额限制，可能导致攻击者使用绕过计划检查的上传范围API密钥上传任意附件，创建公开可读的R2对象，从而实现存储和带宽滥用。

CVSS 5.4 · Medium EPSS 0.36% · P27

Affected Version Matrix 2

VendorProduct Version RangeStatus
Capgo Capgo < 12.128.2 affected
12.128.2 unaffected
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I. Basic Information for CVE-2026-56309

Vulnerability Information
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Vulnerability Title
Capgo - Plan Bypass via Unrestricted Attachment Upload Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Capgo before 12.128.2 fails to enforce plan/quota restrictions on the /files/upload/attachments endpoint, allowing plan-blocked apps to create publicly readable R2 objects. Attackers can upload arbitrary attachments using upload-scoped API keys that bypass plan checks, persist outside normal bundle metadata, and survive app deletion, enabling storage and bandwidth abuse.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Capgo 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Capgo是CAPGO公司的一个专为CapacitorJS开发者打造的移动应用开发和更新平台。 Capgo 12.128.2之前版本存在资源管理错误漏洞，该漏洞源于未对/files/upload/attachments端点执行计划/配额限制，可能导致攻击者使用绕过计划检查的上传范围API密钥上传任意附件，创建公开可读的R2对象，从而实现存储和带宽滥用。
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
Capgo Capgo 0 ~ 12.128.2 -

II. Public POCs for CVE-2026-56309

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III. Intelligence Information for CVE-2026-56309

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Vendor Advisories for CVE-2026-56309 (2)

Same Patch Batch · Capgo · 2026-07-10 · 6 CVEs total

CVE-2026-56305 8.3 HIGH Capgo - Authentication Bypass in Password Change via Missing Current Password Validation
CVE-2026-56279 7.5 HIGH Capgo - Information Disclosure via get_orgs_v7 RPC Endpoint
CVE-2026-56312 6.5 MEDIUM Capgo - Account Creation Before CAPTCHA Validation in accept_invitation Endpoint
CVE-2026-56335 6.5 MEDIUM Capgo - Channel Configuration Mutation via Write-Scoped API Keys
CVE-2026-56329 6.4 MEDIUM Capgo - Cross-Tenant Preview Namespace Collision via Non-Bijective Underscore Decoding

IV. Related Vulnerabilities

Same product: Capgo
Same vendor: Capgo
Same weakness: CWE-770

V. Comments for CVE-2026-56309

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