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CVE-2026-28321 is a critical broken access control vulnerability in SolarWinds Serv-U affecting version 15.5.4 HF1 and earlier on Windows and Linux. Weak access checks allow an authenticated attacker with domain administrator privileges to perform arbitrary file read and write operations within the affected Serv-U environment. This unauthorized file access can then be leveraged to escalate privileges further and, particularly on Linux deployments, achieve code execution with root privileges. The issue is classified as broken access control and has been associated with high impact to confidentiality, integrity, and availability.
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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.
If you can’t patch tonight, do this now.
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.
9 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 critical broken access control vulnerability in SolarWinds Serv-U that allows arbitrary file read/write and can be leveraged to achieve root-level code execution.
A broken access control vulnerability in SolarWinds Serv-U that can allow arbitrary file read/write, leading to privilege escalation and possible code execution as root.
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.