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CVE-2026-28309 is a broken access control vulnerability in SolarWinds Serv-U affecting Windows and Linux deployments, including Serv-U 15.5.4 HF1 and earlier. The flaw allows an authenticated user with domain administrator privileges to create system administrator accounts, indicating an authorization boundary failure between domain-level administrative roles and higher-privileged system-level administrative functions. The issue is classified as CWE-862. Successful exploitation enables privilege escalation within the Serv-U administrative model, with the vendor noting that impact is lower on Windows deployments.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical broken access control vulnerability in SolarWinds Serv-U.
A broken access control vulnerability in SolarWinds Serv-U that allows a domain administrator to create system administrator accounts; the impact is noted as lower in Windows deployments.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.