SolarWinds Serv-U is widely deployed; RCE in this enterprise product is high-impact even though domain-admin is required.
CVE-2026-28308
IDOR in SolarWinds Serv-U allows remote code execution with domain-admin privileges.
Is CVE-2026-28308 being exploited?
Not confirmed. CVE-2026-28308 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 0.79% probability of exploitation in the next 30 days.
How severe is CVE-2026-28308?
CVE-2026-28308 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-2026-28308?
Yes. A fix has been recorded for CVE-2026-28308. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28308 affect?
CVE-2026-28308 affects SolarWinds Serv-U (FTP/SFTP server). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28308?
Isolate Serv-U, remove/restrict domain-admin access, enhance monitoring, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated IDOR enabling remote code execution on Serv-U servers if attacker has domain administrator; Windows deployments less affected.
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.