What is CVE-2026-86390?

CVE-2026-86390 is a medium-severity vulnerability in Dell Powerprotect Data Domain, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-10-28.

How severe is CVE-2026-86390?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Dell Powerprotect Data Domain

CVE-2026-86390

Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain a Missing Authorization vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Unauthorized access.

Vulnerability class: Broken Access Control

Published 2026-10-28 · last modified 2026-10-28.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.6th percentile), scored 2026-10-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Dell Powerprotect Data Domain

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

www.dell.com/support/kbdoc/en-us/000515178/dsa-2026-416-security-update-for-del… (vendor-advisory)

Frequently asked questions

What is CVE-2026-86390?: CVE-2026-86390 is a medium-severity vulnerability in Dell Powerprotect Data Domain, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-10-28.
How severe is CVE-2026-86390?: Medium severity. CVSS v3 base score is 6.5 out of 10.