Vulnerability · Published Jul 21, 2026 · Assigned by SolarWinds
CVE-2026-28321SolarWinds Serv-U Broken Access Control Vulnerability
Critical 9.1
In plain English
A critical-severity improper access control in Serv-U from SolarWinds. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.6%top 52.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SolarWinds | Serv-U | 15.5.4 HF1 and below |
Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H