What is CVE-2026-28321?

CVE-2026-28321 is a critical-severity vulnerability in Solarwinds Serv-u, classified under Improper Access Control. CVSS score: 9.1/10. Published 2026-07-21.

How severe is CVE-2026-28321?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Solarwinds Serv-u

CVE-2026-28321

SolarWinds Serv-U is affected by a broken access control vulnerability that could allow arbitrary file read and write, which can then be used to escalate privileges and execute code as root. A domain administrator access is required, and t…

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Solarwinds Serv-u — versions 15.5.4 HF1 and below

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

psirt@solarwinds.com (vendor-advisory)
psirt@solarwinds.com (release-notes)

Frequently asked questions

What is CVE-2026-28321?: CVE-2026-28321 is a critical-severity vulnerability in Solarwinds Serv-u, classified under Improper Access Control. CVSS score: 9.1/10. Published 2026-07-21.
How severe is CVE-2026-28321?: Critical severity. CVSS v3 base score is 9.1 out of 10.