How severe is CVE-2026-50590?

CVE-2026-50590 has a CVSS 3.x base score of 4.5, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-50590 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-50590?

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

Does CVE-2026-50590 have an EU (EUVD) identifier?

Yes. CVE-2026-50590 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34777.

When was CVE-2026-50590 published?

CVE-2026-50590 was published on 2026-06-05 and last updated on 2026-06-17.

CVE-2026-50590

CVE-2026-50590 is a medium-severity vulnerability with a CVSS 3.x base score of 4.5. 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-732.

Key facts

Severity: Medium (CVSS 3.x base score 4.5)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34777
Weakness: CWE-732
Published: 2026-06-05
Last modified: 2026-06-17

Description

In Mimecast Incydr before 2.6.0, arbitrary file access can occur.

Frequently asked questions

What is CVE-2026-50590?: In Mimecast Incydr before 2.6.0, arbitrary file access can occur.
How severe is CVE-2026-50590?: CVE-2026-50590 has a CVSS 3.x base score of 4.5, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-50590 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-50590?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-50590 have an EU (EUVD) identifier?: Yes. CVE-2026-50590 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34777.
When was CVE-2026-50590 published?: CVE-2026-50590 was published on 2026-06-05 and last updated on 2026-06-17.

References

https://mimecastsupport.zendesk.com/hc/en-us/articles/42665910976659-Insider-risk-agent-release-notes#h_01JVT9C0KZWRTATSB2TFFS4Q51

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