CVE-2026-28305
SolarWinds Serv-U Insecure Direct Object Reference (IDOR) Vulnerability
No known exploitation. EPSS puts it in the 54th percentile. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
Steps
Written by AI from the record- Check whether you run Serv-U and identify its installed version and administrator accounts with home-directory read/write access.
- Upgrade Serv-U to version 2026.3.
- Until upgraded, limit Serv-U domain administrator access and remove unnecessary read/write permissions to user home directories.
- Review administrator activity and investigate unexpected file or server configuration changes.
What it is
From the CVE record
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.
In plain language
Written by AI from the recordServ-U has a serious server-control flaw, so businesses using it should upgrade quickly, especially if high-level administrator accounts are widely available.
CVE-2026-28305 is a critical network-reachable IDOR in Serv-U that lets a domain administrator with read/write access to a user home directory gain root-level control of the host.
If you're affected
- Full server takeover
- File access and modification
- Service disruption
- Potential data exposure
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.8% chance of exploitation activity in the next 30 days, which ranks it in the 54th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
13 events over 3 days, from the signal feeds we watch.
- OpenVAS check addedpatch available, patch available, record updated, record updated
- Patch availablerecord updated
- Patch availablepatch available, published, weakness classified, att&ck mapped, record updated
Affected products
And 1 more affected product. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Scored 9.1 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required HighRequires admin or elevated privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
- Initial AccessT1078Valid Accountshigh confidence
Sources
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We'll flag the next CVE, public exploit or patch for Serv-U, not every advisory.
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