Critical privilege escalation in SolarWinds Serv-U (widely used enterprise product); can yield full admin control and enable broad impact across environments.
CVE-2026-28310
Privilege escalation in SolarWinds Serv-U: domain admin -> system admin.
Is CVE-2026-28310 being exploited?
Not confirmed. CVE-2026-28310 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-28310?
CVE-2026-28310 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-28310?
Yes. A fix has been recorded for CVE-2026-28310. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28310 affect?
CVE-2026-28310 affects SolarWinds Serv-U Server (FTP/SFTP), Serv-U for Windows, Serv-U for Linux. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28310?
Apply vendor patch when available; meanwhile restrict admin accounts and isolate Serv-U servers.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows a domain admin account to elevate to Serv-U system administrator, enabling full server control, config changes, credential access, and lateral movement.
Immediate action required
- affected15.5.4 HF1 and below
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.