CVE-2026-56316Public exploitNetwork attack vector

Builder job enumeration via unauthenticated OPTIONS requests

Published Jun 21, 2026 · Updated Jun 21, 2026

Information disclosure in Capgo before 12.128.2 allows remote attackers to enumerate valid builder job IDs through unauthenticated OPTIONS requests. The OPTIONS /build/upload/:jobId/* route omits API-key middleware and passes the supplied ID to tusProxy, whose database lookup produces distinguishable responses for valid and invalid IDs. No account or user interaction is required, and repeated requests consume backend resources without a demonstrated service interruption.

CVSS severity6.9
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in Capgo before 12.128.2 allows remote attackers to enumerate valid builder job IDs through unauthenticated OPTIONS requests. The OPTIONS /build/upload/:jobId/* route omits API-key middleware and passes the supplied ID to tusProxy, whose database lookup produces distinguishable responses for valid and invalid IDs. No account or user interaction is required, and repeated requests consume backend resources without a demonstrated service interruption.

The record

CVE
CVE-2026-56316
Published
Jun 21, 2026
Updated
Jun 21, 2026
Vendor
Capgo
Product
Capgo
Classifications
CWE-203, CWE-400, T1595
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesunauthenticated

What is affected?

Capgo · Capgoversion=0 <12.128.2

Published CVSS scores

5.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-203Observable Discrepancy
CWE-400Uncontrolled Resource Consumption
T1595Active Scanning

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo