How severe is CVE-2026-3438?

CVE-2026-3438 has a CVSS 4.0 base score of 5.1, rated medium severity.

Is CVE-2026-3438 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3438?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3438 have an EU (EUVD) identifier?

Yes. CVE-2026-3438 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20757.

When was CVE-2026-3438 published?

CVE-2026-3438 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-3438

CVE-2026-3438 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. 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-79.

Key facts

Severity: Medium (CVSS 4.0 base score 5.1)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20757
Weakness: CWE-79
Published: 2026-04-08
Last modified: 2026-06-17

Description

A reflected cross-site scripting vulnerability exists in Sonatype Nexus Repository versions 3.0.0 through 3.90.2 that allows unauthenticated remote attackers to execute arbitrary JavaScript in a victim's browser through a specially crafted URL. Exploitation requires user interaction.

Frequently asked questions

What is CVE-2026-3438?: A reflected cross-site scripting vulnerability exists in Sonatype Nexus Repository versions 3.0.0 through 3.90.2 that allows unauthenticated remote attackers to execute arbitrary JavaScript in a victim's browser through a specially crafted URL. Exploitation requires user interaction.
How severe is CVE-2026-3438?: CVE-2026-3438 has a CVSS 4.0 base score of 5.1, rated medium severity.
Is CVE-2026-3438 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-3438?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3438 have an EU (EUVD) identifier?: Yes. CVE-2026-3438 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20757.
When was CVE-2026-3438 published?: CVE-2026-3438 was published on 2026-04-08 and last updated on 2026-06-17.

References

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

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CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
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CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

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