How severe is CVE-2026-42539?

CVE-2026-42539 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-42539 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42539?

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

Does CVE-2026-42539 have an EU (EUVD) identifier?

Yes. CVE-2026-42539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34327.

When was CVE-2026-42539 published?

CVE-2026-42539 was published on 2026-06-04 and last updated on 2026-06-17.

CVE-2026-42539

CVE-2026-42539 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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-201.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34327
Weakness: CWE-201
Published: 2026-06-04
Last modified: 2026-06-17

Description

IRIS is a web collaborative platform that helps incident responders share technical details during investigations. Versions prior to 2.4.28 return sensitive data to the user which are not required for the client’s operation. Version 2.4.28 contains a patch.

Frequently asked questions

What is CVE-2026-42539?: IRIS is a web collaborative platform that helps incident responders share technical details during investigations. Versions prior to 2.4.28 return sensitive data to the user which are not required for the client’s operation. Version 2.4.28 contains a patch.
How severe is CVE-2026-42539?: CVE-2026-42539 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-42539 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42539?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42539 have an EU (EUVD) identifier?: Yes. CVE-2026-42539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34327.
When was CVE-2026-42539 published?: CVE-2026-42539 was published on 2026-06-04 and last updated on 2026-06-17.

References

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