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CVE-2026-28313 is an insecure direct object reference vulnerability in SolarWinds Serv-U affecting version 15.5.4 HF1 and earlier on Windows and Linux. The flaw allows improper access to object references within Serv-U in a way that can be abused to manipulate SMTP-related functionality. Successful exploitation can result in SMTP hijacking and arbitrary takeover of user accounts. Available reporting indicates the issue is network-reachable, requires no user interaction, and occurs in the context of an authenticated attacker with elevated privileges. The impact is noted as lower on Windows deployments than on Linux 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.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical IDOR vulnerability in SolarWinds Serv-U that could enable account compromise through SMTP manipulation.
An insecure direct object reference (IDOR) vulnerability in SolarWinds Serv-U that can enable SMTP hijacking and arbitrary account takeover.
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.