How severe is CVE-2026-96940?

CVE-2026-96940 has a CVSS 3.x base score of 8.8, 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 high, and availability high.

Is CVE-2026-96940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-96940?

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.

When was CVE-2026-96940 published?

CVE-2026-96940 was published on 2026-10-02 and last updated on 2026-10-06.

CVE-2026-96940

CVE-2026-96940 is a high-severity vulnerability with a CVSS 3.x base score of 8.8. 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-1390.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1390
Published: 2026-10-02
Last modified: 2026-10-06

Description

Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.

Frequently asked questions

What is CVE-2026-96940?: Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.
How severe is CVE-2026-96940?: CVE-2026-96940 has a CVSS 3.x base score of 8.8, 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 high, and availability high.
Is CVE-2026-96940 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-96940?: 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.
When was CVE-2026-96940 published?: CVE-2026-96940 was published on 2026-10-02 and last updated on 2026-10-06.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940

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