CVE-2026-56280Public exploitNetwork attack vector

Build cancellation via privileged SSE disconnect handler

Published Jun 22, 2026 · Updated Jun 22, 2026

Missing authorization in Capgo before 12.128.2 allows remote authenticated users with read-only API keys to cancel running native builds. GET /build/logs/:jobId attaches an unconditional SSE abort handler that calls cancelBuildOnDisconnect() with the server's privileged BUILDER_API_KEY instead of rechecking app.build_native. A read-only key and a running build are required; dropping the log-stream connection interrupts the build and can repeatedly disrupt CI/CD workflows.

CVSS severity7.1
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Capgo before 12.128.2 allows remote authenticated users with read-only API keys to cancel running native builds. GET /build/logs/:jobId attaches an unconditional SSE abort handler that calls cancelBuildOnDisconnect() with the server's privileged BUILDER_API_KEY instead of rechecking app.build_native. A read-only key and a running build are required; dropping the log-stream connection interrupts the build and can repeatedly disrupt CI/CD workflows.

The record

CVE
CVE-2026-56280
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Capgo
Product
Capgo
Classifications
CWE-862, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 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

7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
7.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

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-862Missing Authorization
T1499Endpoint Denial of Service

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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