CVE-2026-55052: Microsoft SharePoint Elevation of Privilege Vulnerability

highCVSS 8.8CVE-2026-55052

Missing authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoft product: SharePoint Privilege escalation

What: Missing authorization in SharePoint allows authorized privilege escalation over a network.
Who is affected: Authorized users of Microsoft Office SharePoint.
Urgency: Remediation is urgent due to the high severity and potential for privilege escalation.
Action: Update SharePoint to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch SharePoint

Get an email when a new SharePoint advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55052

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-550520.65% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55052	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedNCSC-2026-0237 [1.02] [H/H] Vulnerabilities Fixed in Microsoft Officencsc-nl
unknownexploitedNCSC-2026-0237 [1.01] [H/H] Vulnerabilities fixed in Microsoft Officencsc-nl
unknownMultiple vulnerabilities in Microsoft products (July 15, 2026)cert-fr-avis
unknownexploitedNCSC-2026-0237 [1.00] [M/H] Vulnerabilities fixed in Microsoft Officencsc-nl
highCVE-2026-55052: Missing authorization in Microsoft Office SharePoint allows an authorized attacker to elevate …nvd

Recent advisories for Microsoft SharePoint Elevation

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-58277: Improper authorization in Microsoft Office SharePoint allows an authorized attacker to elevate…nvd · 2026-07-14
highCVE-2026-55052: Missing authorization in Microsoft Office SharePoint allows an authorized attacker to elevate …nvd · 2026-07-14
mediumexploitedCVE-2026-56164: Missing authentication for critical function in Microsoft Office SharePoint allows an unauthor…nvd · 2026-07-14
highCVE-2026-58277: Microsoft SharePoint Elevation of Privilege Vulnerabilitymsrc · 2026-07-14
mediumexploitedCVE-2026-56164: Microsoft SharePoint Server Elevation of Privilege Vulnerabilitymsrc · 2026-07-14
highCVE-2026-45484: Microsoft SharePoint Elevation of Privilege Vulnerabilitymsrc · 2026-06-09