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 the impact is lower in Windows installations.
EPSS: 0.006 (45.3th percentile) — read the EPSS interpretation.
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)
References
- psirt@solarwinds.com (vendor-advisory, Vendor Advisory)
- psirt@solarwinds.com (release-notes, Release Notes, Vendor Advisory)
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.