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cve recordmediumexploited in the wild

CVE-2026-56164

Microsoft · SharePoint Server · Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability

Published · Added to CISA KEV
CVSS5.3
Severitymedium
WeaknessCWE-306
ExploitedYes, in CISA KEV
Ransomware useUnknown
Federal fix dueJul 17, 2026

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Description

Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Required action (CISA)

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

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Our coverage of CVE-2026-56164

CVE-2026-55040critical

Attackers Exploit SharePoint Authentication Bypass After Public PoC Release

Threat actors are actively exploiting a critical Microsoft SharePoint vulnerability, CVE-2026-55040, following the public release of a proof-of-concept (PoC) exploit. This security feature bypass allows unauthenticated attackers to impersonate users and potentially modify data by exploiting weaknesses in JWT token validation. Microsoft had previously patched this flaw in its July 2026 updates.

CVE-2008-4128high

July 2026 CVE Landscape

In July 2026, a significant increase in high-impact vulnerabilities was observed, with 85 critical flaws identified, 36 of which had a Very Critical Recorded Future Risk Score. A notable portion of these vulnerabilities were either already listed in CISA's Known Exploited Vulnerabilities catalog or were reported by vendors. The vulnerabilities affected a wide range of products from 61 vendors, with Microsoft products being the most frequently impacted.