CVE-2026-58277: Microsoft SharePoint Elevation of Privilege Vulnerability

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

CSIRTS triage

What: Improper authorization allows an authorized attacker to elevate privileges over a network.
Who is affected: Authorized users of Microsoft Office SharePoint.
Urgency: Remediation is urgent due to high severity and potential for privilege escalation.
Action: Apply the latest security update to address the vulnerability.

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

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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-2026-582770.89% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 56% of all scored CVEs.

CVE	CSIRTS overview	External
CVE-2026-58277	coverage & exploitation status	NVD · CVE.org

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