Threat Intelligence / CVE / CVE-2026-55003

CVE-2026-55003 — Microsoft Windows 10 Version 1607

CVSS v3.1 6.5 (MEDIUM) · EPSS 0.6% (higher than 47.6% of all scored CVEs) · Priority 5.2/10 · Published 2026-07-14

As of 2026-07-15, CVE-2026-55003 is a MEDIUM-severity vulnerability in Microsoft Windows 10 Version 1607, CVSS v3.1 6.5, EPSS 0.6% (47.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-55003, most recently “Windows RDP Memory-Disclosure Vulnerabilities (CVE-2026-50445, CVE-2026-57982, CVE-2026-55003, CVE-2026-50497, CVE-2026-57979) — July 2026 Patch Tuesday”.

Last updated: 2026-07-15

What is CVE-2026-55003?

Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.

The record classifies CVE-2026-55003 under weakness class CWE-908. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 68 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 6.5 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
EPSS (FIRST): 0.6% probability of exploitation in the next 30 days, higher than 47.6% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 5.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-07-14, last modified 2026-07-15

Is CVE-2026-55003 being exploited?

No public exploitation evidence for CVE-2026-55003 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-15. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

Microsoft: Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016

How to fix CVE-2026-55003

No vendor patch reference has been recorded for CVE-2026-55003 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-55003

1 tracked threat in the Threadlinqs corpus references CVE-2026-55003, either in the campaign’s CVE list or as an indicator on the campaign record.

Windows RDP Memory-Disclosure Vulnerabilities (CVE-2026-50445, CVE-2026-57982, CVE-2026-55003, CVE-2026-50497, CVE-2026-57979) — July 2026 Patch Tuesday — MEDIUM · 2026-07-15

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-16. This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

msrc.microsoft.com — vendor advisory

Full detection coverage & IOCs for threats exploiting CVE-2026-55003 are available via the Threadlinqs MCP server (Purple tier). View plans →

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