How severe is CVE-2026-57303?

CVE-2026-57303 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-57303 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-57303?

CVE-2026-57303 affects Jenkins Assembla. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-57303?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-57303 have an EU (EUVD) identifier?

Yes. CVE-2026-57303 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38784.

When was CVE-2026-57303 published?

CVE-2026-57303 was published on 2026-06-24 and last updated on 2026-06-25.

CVE-2026-57303

CVE-2026-57303 is a high-severity vulnerability in Jenkins Assembla with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38784
Weakness: CWE-918
Affected product: Jenkins Assembla
Published: 2026-06-24
Last modified: 2026-06-25

Description

Jenkins Assembla Plugin 1.4 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks, allowing attackers able to control the responses of the configured Assembla server to extract secrets from the Jenkins controller or perform server-side request forgery.

Frequently asked questions

What is CVE-2026-57303?: Jenkins Assembla Plugin 1.4 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks, allowing attackers able to control the responses of the configured Assembla server to extract secrets from the Jenkins controller or perform server-side request forgery.
How severe is CVE-2026-57303?: CVE-2026-57303 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-57303 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-57303?: CVE-2026-57303 affects Jenkins Assembla. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-57303?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-57303 have an EU (EUVD) identifier?: Yes. CVE-2026-57303 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38784.
When was CVE-2026-57303 published?: CVE-2026-57303 was published on 2026-06-24 and last updated on 2026-06-25.

References

https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3692%20(1)

Affected products (1)

cpe:2.3:a:jenkins:assembla:*:*:*:*:*:jenkins:*:*

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