What is CVE-2026-86400?

CVE-2026-86400 is a critical-severity vulnerability in Dell Powerprotect Data Domain, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-10-28.

How severe is CVE-2026-86400?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Dell Powerprotect Data Domain

CVE-2026-86400

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 an Improper Authentication vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to arbitrary command execution with root privileges. This is a critical severity vulnerability as it allows an attacker to take complete control of the system. Dell recommends customers to upgrade at the earliest opportunity.

Vulnerability class: Broken Authentication

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (59.4th percentile), scored 2026-10-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.4% 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-287 — Improper Authentication

References

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

Frequently asked questions

What is CVE-2026-86400?: CVE-2026-86400 is a critical-severity vulnerability in Dell Powerprotect Data Domain, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-10-28.
How severe is CVE-2026-86400?: Critical severity. CVSS v3 base score is 9.8 out of 10.