How severe is CVE-2026-83784?

CVE-2026-83784 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-2026-83784 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-83784?

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-2026-83784 published?

CVE-2026-83784 was published on 2026-10-13 and last updated on 2026-10-16.

CVE-2026-83784

CVE-2026-83784 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-36.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-36
Published: 2026-10-13
Last modified: 2026-10-16

Description

Absolute path traversal in Windows Encrypting File System (EFS) allows an authorized attacker to elevate privileges over a network.

Frequently asked questions

What is CVE-2026-83784?: Absolute path traversal in Windows Encrypting File System (EFS) allows an authorized attacker to elevate privileges over a network.
How severe is CVE-2026-83784?: CVE-2026-83784 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-2026-83784 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-83784?: 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-2026-83784 published?: CVE-2026-83784 was published on 2026-10-13 and last updated on 2026-10-16.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83784

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