How severe is CVE-2026-42540?

CVE-2026-42540 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-42540 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42540?

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

Does CVE-2026-42540 have an EU (EUVD) identifier?

Yes. CVE-2026-42540 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34328.

When was CVE-2026-42540 published?

CVE-2026-42540 was published on 2026-06-04 and last updated on 2026-06-17.

CVE-2026-42540

CVE-2026-42540 is a medium-severity vulnerability with a CVSS 3.x base score of 4.3. 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-915.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34328
Weakness: CWE-915
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 allow a user to alter values in the database via manipulated API requests. Version 2.4.28 contains a patch.

Frequently asked questions

What is CVE-2026-42540?: IRIS is a web collaborative platform that helps incident responders share technical details during investigations. Versions prior to 2.4.28 allow a user to alter values in the database via manipulated API requests. Version 2.4.28 contains a patch.
How severe is CVE-2026-42540?: CVE-2026-42540 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-42540 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42540?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42540 have an EU (EUVD) identifier?: Yes. CVE-2026-42540 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34328.
When was CVE-2026-42540 published?: CVE-2026-42540 was published on 2026-06-04 and last updated on 2026-06-17.

References

https://github.com/dfir-iris/iris-web/security/advisories/GHSA-w78h-mx7h-qm3h

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