Threat Intelligence / CVE / CVE-2026-21262

CVE-2026-21262 — Microsoft Sql Server 2016

CVSS v3.1 8.8 (HIGH) · EPSS 0.1% (higher than 35.7% of all scored CVEs) · Priority 5.8/10 · Published 2026-03-10

As of 2026-03-13, CVE-2026-21262 is a HIGH-severity vulnerability in Microsoft Sql Server 2016, CVSS v3.1 8.8, EPSS 0.1% (35.7th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-21262, most recently “CVE-2026-21262: Microsoft SQL Server Elevation of Privilege via Improper Access Control in Merge Replication”.

Last updated: 2026-03-13

What is CVE-2026-21262?

Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

The record classifies CVE-2026-21262 under weakness class CWE-284. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 5 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 187 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 35.7% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
5.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-03-10, last modified 2026-03-13

Is CVE-2026-21262 being exploited?

It currently carries a trending score of 14 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-21262

The record marks a vendor fix as available for CVE-2026-21262. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21262. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21262. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-21262

2 tracked threats in the Threadlinqs corpus reference CVE-2026-21262, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from research and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-21262 are available via the Threadlinqs MCP server (Purple tier). View plans →

← all vulnerabilities · Markdown version · Threadlinqs Intelligence