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CVE-2026-21262 is an elevation-of-privilege vulnerability in Microsoft SQL Server caused by improper access control. The flaw allows an authenticated attacker with low or basic privileges on a vulnerable SQL Server instance to elevate privileges over the network and obtain SQL Server sysadmin-level access. Public reporting indicates the issue affects SQL Server 2016 and later supported releases, including SQL Server 2016, 2017, 2019, 2022, and 2025 update branches. The vulnerability was publicly disclosed prior to patch availability, increasing defender urgency even though no confirmed in-the-wild exploitation was reported at release time.
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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.
71 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An actively exploited improper access control vulnerability affecting Microsoft SQL Server versions 2016, 2019, 2022, and 2025.
An SQL Server elevation-of-privilege vulnerability disclosed in Microsoft's Patch Tuesday release.
An elevation-of-privilege vulnerability in Microsoft SQL Server that could allow an authenticated attacker to gain SQLAdmin privileges over a network.
An elevation-of-privilege vulnerability in Microsoft SQL Server that could allow an authenticated attacker to gain SQLAdmin privileges over a network.
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.