CVE-2026-58277: Improper authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

highCVSS 8.8CVE-2026-58277

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

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 8.8
Published: 2026-07-14
Last updated: 2026-07-15
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-58277

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

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-58277	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
unknownexploitedNCSC-2026-0237 [1.00] [M/H] Vulnerabilities fixed in Microsoft Officencsc-nl
highCVE-2026-58277: Microsoft SharePoint Elevation of Privilege Vulnerabilitymsrc

Recent advisories for Improper authorization in

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.

unknownCVE-2026-14538: An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-s…nvd · 2026-07-31
highCVE-2026-58222: A security flaw combining LDAP filter injection and improper authorization checks was found in…nvd · 2026-07-30
unknownCVE-2026-23981: An Improper Authorization vulnerability exists in Apache Superset allowing an authenticated us…nvd · 2026-07-30
mediumCVE-2026-66751: Let's Chat 0.3.0 through 0.4.8 contains an improper authorization vulnerability that allows an…nvd · 2026-07-28
mediumCVE-2026-61487: Improper Authorization vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ All, Apache Ac…nvd · 2026-07-28
criticalCVE-2026-62835: Improper authorization in Azure Portal allows an unauthorized attacker to disclose information…nvd · 2026-07-24