How severe is GHSA-wg26-8wmj-cf9p?

GHSA-wg26-8wmj-cf9p has a CVSS score of 4.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-wg26-8wmj-cf9p?

GHSA-wg26-8wmj-cf9p affects the following packages: org.jenkins-ci.plugins:github-branch-source (Maven). Ecosystems affected: Maven.

How do I fix GHSA-wg26-8wmj-cf9p?

Update org.jenkins-ci.plugins:github-branch-source to 1967.1969.v205fd594c821 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wg26-8wmj-cf9p is resolved across your whole dependency graph.

How do I detect GHSA-wg26-8wmj-cf9p in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:github-branch-source, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-wg26-8wmj-cf9p if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is GHSA-wg26-8wmj-cf9p actively exploited in the wild?

No public exploit code has been indexed for GHSA-wg26-8wmj-cf9p yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-wg26-8wmj-cf9p?

GHSA-wg26-8wmj-cf9p has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 8th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-wg26-8wmj-cf9p?

GHSA-wg26-8wmj-cf9p is classified as CWE-862 (CWE-862). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-wg26-8wmj-cf9p published, and has it been updated?

GHSA-wg26-8wmj-cf9p was published on April 29, 2026 and was last updated on May 6, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

Jenkins GitHub Branch Source Plugin: Missing permissions check allows attackers to perform a connection testGHSA-wg26-8wmj-cf9p

MEDIUM

GHSA-wg26-8wmj-cf9p is a medium-severity (CVSS 4.3) CWE-862 vulnerability in org.jenkins-ci.plugins:github-branch-source. A fix is available for org.jenkins-ci.plugins:github-branch-source — see the affected versions and patch details below.

Also known asCVE-2026-42522

Published

Apr 29, 2026

Updated

May 6, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-wg26-8wmj-cf9p.

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

☕org.jenkins-ci.plugins:github-branch-source

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Jenkins GitHub Branch Source Plugin versions 1967.vdea_d580c1a_b_a_ and earlier do not perform a permission check in a method implementing form validation.

This allows attackers with Overall/Read permission to connect to an attacker-specified URL with attacker-specified GitHub App credentials.

GitHub Branch Source Plugin 1967.1969.v205fd594c821 requires Overall/Manage permission to perform the connection test.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jenkins-ci.plugins:github-branch-source`	all versions	1967.1969.v205fd594c821`org.jenkins-ci.plugins:github-branch-source:1967.1969.v205fd594c821`

Affected Products

1 product · 1 configurations

Application

github branch sourcejenkins

≤ 1967.vdea_d580c1a_b_a

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:github-branch-source, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jenkins-ci.plugins:github-branch-source to 1967.1969.v205fd594c821 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wg26-8wmj-cf9p is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Jenkins GitHub Branch Source Plugin versions 1967.vdea_d580c1a_b_a_ and earlier do not perform a permission check in a method implementing form validation. This allows attackers with Overall/Read permission to connect to an attacker-specified URL with attacker-specified GitHub App credentials. GitHub Branch Source Plugin 1967.1969.v205fd594c821 requires Overall/Manage permission to perform the connection test.

O3 Security · Impact-Aware SCA

Is GHSA-wg26-8wmj-cf9p in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

4.3/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWE Classification

CWE-862CWE-862

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Apr 29, 2026

Last updated

May 6, 2026

Identifiers

GHSA-wg26-8wmj-cf9p

References

Advisorynvd.nist.gov · CVE 2026 42522 Webjenkins.io · 2026 04 29

Related vulnerabilities

Also affects github-branch-source

This CVE is medium severity, in line with the other 5 CVEs affecting github-branch-source.

CVE-2026-57285CVE-2026-42522CVE-2017-1000087CVE-2017-1000091CVE-2018-1000185

Same weakness: CWE-862

This CVE is medium severity; 3 of 3 other CVEs with CWE-862 are rated as high or higher (top: critical).

GHSA-47w9-6r3f-938gCVE-2026-16454CVE-2026-12411Browse all CWE-862

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedMay 6, 2026

Jenkins GitHub Branch Source Plugin: Missing permissions check allows attackers to perform a connection testGHSA-wg26-8wmj-cf9p

Exploitation Status

No confirmed exploitation observed yet

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is GHSA-wg26-8wmj-cf9p in your dependencies?