CVE-2026-28313: SolarWinds Serv-U

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to SMTP hijacking leading to arbitrary account takeover. The impact is lower in Windows deployments.

Affected products

• SolarWinds Serv-U: before 2026.3 (fixed in 2026.3)

Published 2026-07-21. Last modified 2026-07-24.