CVE-2026-28321: SolarWinds Serv-U Broken Access Control Vulnerability

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-21 · updated 2026-10-24
Weakness: CWE-284

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

SolarWinds Serv-U: before 2026.3 — fixed in 2026.3

How to fix

Upgrade to a fixed version: SolarWinds Serv-U 2026.3. Check the vendor advisory for mitigations.

References

https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htm
https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28321

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