CVE-2026-42522Network attack vector

Authenticated outbound connections via unguarded connection test

Published Apr 29, 2026 · Updated Apr 29, 2026

Missing authorization in GitHub Branch Source 1967.vdea_d580c1a_b_a_ and earlier allows remote authenticated users to initiate outbound connections. The GitHubAppCredentials.DescriptorImpl.doTestConnection form-validation method accepts an API URI and GitHub App credential fields, creates temporary credentials, and tests the supplied endpoint without checking Overall/Manage. Overall/Read access is sufficient to make the Jenkins controller contact an attacker-selected URL with attacker-provided credentials, while the published impact is limited to unauthorized connection attempts.

CVSS severity4.3
Medium
EPSS probability0.18%
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 GitHub Branch Source 1967.vdea_d580c1a_b_a_ and earlier allows remote authenticated users to initiate outbound connections. The GitHubAppCredentials.DescriptorImpl.doTestConnection form-validation method accepts an API URI and GitHub App credential fields, creates temporary credentials, and tests the supplied endpoint without checking Overall/Manage. Overall/Read access is sufficient to make the Jenkins controller contact an attacker-selected URL with attacker-provided credentials, while the published impact is limited to unauthorized connection attempts.

The record

CVE
CVE-2026-42522
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Jenkins Project
Product
GitHub Branch Source
Classifications
CWE-862, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 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 <=1967.vdea_d580c1a_b_a_

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · GitHub Branch Sourceversion=0 <=1967.vdea_d580c1a_b_a_

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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