Critical severity · published Jul 21, 2026
CVE-2026-28309
SolarWinds Serv-U Broken Access Control Vulnerability
9.1
CVSS
0.5%
EPSS
No
On KEV
Description
SolarWinds Serv-U is affected by a broken access control vulnerability that allows a domain administrator to create system administrator accounts. The impact is lower in Windows deployments.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
Serv-U · SolarWinds
15.5.4 HF1 and below · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28309
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28309
Release Notes
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htm
Vendor Advisory
https://https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28309
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CVE-2020-35481
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