CVE-2026-56230Public exploitNetwork attack vector

Cross-tenant resource access via unchecked key ownership

Published Jun 30, 2026 · Updated Jun 30, 2026

Broken object level authorization in Capgo before 12.128.2 allows remote authenticated users to access cross-tenant resources via a crafted header. The middlewareKey() function resolves the client-controlled x-limited-key-id value and replaces the request authentication context without checking whether the referenced limited key belongs to the authenticated API-key owner. Any valid API key is sufficient; the adopted scope exposes another tenant's applications and permits unauthorized operations on routes that share the middleware.

CVSS severity8.7
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken object level authorization in Capgo before 12.128.2 allows remote authenticated users to access cross-tenant resources via a crafted header. The middlewareKey() function resolves the client-controlled x-limited-key-id value and replaces the request authentication context without checking whether the referenced limited key belongs to the authenticated API-key owner. Any valid API key is sufficient; the adopted scope exposes another tenant's applications and permits unauthorized operations on routes that share the middleware.

The record

CVE
CVE-2026-56230
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Capgo
Product
Capgo
Classifications
CWE-639, CWE-284, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <12.128.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Capgo · Capgoversion=0 <12.128.2

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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