Auth bypass in Solarwinds Serv-U
CVE-2026-28305
SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to remote code execution as root. A domain account with admin privileges and read and write access to the home directory is required. The impact is lower in Windows deployments.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Solarwinds Serv-U — versions 15.5.4 HF1 and below
Weakness classification (CWE)
References
- www.solarwinds.com/trust-center/security-advisories/CVE-2026-28305 (vendor-advisory, Vendor Advisory)
- documentation.solarwinds.com/en/success_center/servu/content/release_notes/serv… (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-28305?
- CVE-2026-28305 is a critical-severity vulnerability in Solarwinds Serv-U, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.1/10. Published 2026-07-21.
- How severe is CVE-2026-28305?
- Critical severity. CVSS v3 base score is 9.1 out of 10.