CVE-2026-56164: Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
CSIRTS triage
- What
- Missing authentication for a critical function in Microsoft Office SharePoint allows unauthorized privilege elevation.
- Who is affected
- Users of Microsoft Office SharePoint.
- Urgency
- Remediation is urgent due to active exploitation of this vulnerability.
- Action
- Users should apply the latest patches provided by Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-56164
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.
- Exploitation confirmedCVE-2026-56164Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 97% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56164 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedSecurity Alert: [Updated] Microsoft Releases July 2026 Security Updatesjpcert
- criticalexploitedMicrosoft security advisory – July 2026 monthly rollup (AV26-698) – Update 3cccs
- criticalexploited2026-009: Critical Vulnerabilities in Microsoft SharePointcert-eu
- 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
- criticalexploitedAL26-017 - Critical vulnerabilities impacting Microsoft SharePoint Server – CVE-2026-56164, CVE-2026-55040 and…cccs
- unknownMicrosoft Monthly Security Update (July 2026)hkcert
- unknownMultiple vulnerabilities in Microsoft products (July 15, 2026)cert-fr-avis
- unknownexploitedNCSC-2026-0237 [1.00] [M/H] Vulnerabilities fixed in Microsoft Officencsc-nl
- criticalexploitedCISA Adds Four Known Exploited Vulnerabilities to Catalogcisa
- unknownexploitedCISA Urges SharePoint Hardening After New Exploitationscisa
- mediumexploitedCVE-2026-56164: Microsoft SharePoint Server Elevation of Privilege Vulnerabilitymsrc
Recent advisories for Missing authentication for
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-2026-15227: Missing authorization in Checkmk <2.5.0p10, <2.4.0p35, <2.3.0p49, and 2.2.0 (EOL) allows an au…nvd · 2026-07-31
- criticalCVE-2026-67594: Spikster through commit e1cdf8c contains a missing authentication vulnerability that allows un…nvd · 2026-07-30
- highCVE-2026-12722: Missing authentication for critical function vulnerability in FTC Software IT Services FTC E-C…nvd · 2026-07-30
- criticalCVE-2026-44101: Due to missing authentication the CHARX OCPP Agent service allows an unauthenticated remote at…nvd · 2026-07-30
- criticalCVE-2026-44090: Due to missing authentication, an unauthenticated remote attacker may access the MQTT broker, …nvd · 2026-07-30
- highCVE-2026-5057: ATEN Unizon RpcProvider Missing Authentication Denial-of-Service Vulnerability. This vulnerabil…nvd · 2026-07-29
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