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CVE-2026-42523

Jenkins Github cross-site scripting (XSS)

9.0 CRITICALEPSS 0.50%
  1. Published29 Apr 2026

Description

Jenkins GitHub Plugin 1.46.0 and earlier improperly processes the current job URL as part of JavaScript implementing validation of the feature "GitHub hook trigger for GITScm polling", resulting in a stored cross-site scripting (XSS) vulnerability exploitable by non-anonymous attackers with Overall/Read permission.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

Jenkins Github< 1.46.0.1

Remediation

Fixed in
Jenkins Github≥ 1.46.0.1

References

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Frequently asked

Is CVE-2026-42523 being actively exploited?

CVE-2026-42523 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.50%.

How severe is CVE-2026-42523?

CVE-2026-42523 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2026-42523?

Affected products include Jenkins Github.

How do I fix CVE-2026-42523?

Upgrade affected software to a fixed version, for example Jenkins Github 1.46.0.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42523 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.