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Microsoft

Vendor security scorecard – 4364 CVEs in the selected period

Period: 30d 90d 6m 1y All
Risk 18148
4364
CVEs
371
Critical
2721
High
33
KEV
238
PoC
400
Unpatched C/H
86.5%
Patch Rate
0.4%
Avg EPSS

Severity Breakdown

CRITICAL
371
HIGH
2721
MEDIUM
1188
LOW
77

Monthly CVE Trend

Top Risky CVEs

CVE Summary Severity CVSS EPSS Priority Signals
CVE-2025-9242 WatchGuard Fireware OS contains an out-of-bounds write in IKEv2 VPN handling enabling unauthenticated remote code execution on WatchGuard firewalls. CRITICAL 9.3 69.0% 185
KEV PoC No patch
CVE-2026-50522 Remote code execution in Microsoft SharePoint Server (2016, 2019, and Subscription Edition) lets an unauthenticated attacker run arbitrary code by sending a crafted serialized payload over the network. The flaw is an untrusted-data deserialization (CWE-502) rated CVSS 9.8 with PR:N/UI:N, meaning no credentials or user interaction are required. No public exploit identified at time of analysis, but the pre-auth network vector and SharePoint's long history as an attacker target make this a high-priority patch. CRITICAL 9.8 19.7% 159
KEV PoC
CVE-2026-58644 Remote code execution in Microsoft SharePoint (Enterprise Server 2016, Server 2019, and Server Subscription Edition) allows an unauthenticated network attacker to run arbitrary code on the server by submitting maliciously crafted serialized data (CWE-502). The CVSS 3.1 base score is 9.8 with a fully remote, no-interaction, no-privilege vector (AV:N/AC:L/PR:N/UI:N), placing it among the most severe SharePoint flaws. There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but insecure-deserialization RCE in SharePoint has historically been a high-value target for rapid weaponization. CRITICAL 9.8 1.3% 150
KEV PoC
CVE-2025-13315 Twonky Server 8.5.2 on Linux and Windows allows unauthenticated access to the admin log file through a web service API bypass. The exposed log contains the administrator's username and encrypted password, which can be decrypted using hard-coded keys (CVE-2025-13316) to gain full administrative control. CRITICAL 9.3 82.4% 149
PoC No patch
CVE-2026-55040 Security feature bypass in Microsoft SharePoint (Enterprise Server 2016, Server 2019, and Server Subscription Edition) lets a network-based, unauthenticated attacker defeat a weak-authentication protection mechanism (CWE-1390) to gain high-impact access to confidentiality and integrity. Rated CVSS 9.1 with no attacker privileges or user interaction required, this is a serious pre-authentication issue in a widely deployed collaboration platform. Microsoft has published a fix, and there is no public exploit identified at time of analysis. CRITICAL 9.1 0.7% 146
KEV PoC
CVE-2026-56164 Privilege elevation in Microsoft SharePoint Server (Enterprise Server 2016, Server 2019, and Subscription Edition) lets an unauthenticated network attacker reach a security-critical function that lacks any authentication check (CWE-306), gaining elevated privileges on the target farm. The flaw is confirmed actively exploited (CISA KEV) with publicly available exploit code, and its CVSS 3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N) reflects fully remote, unauthenticated exploitation with high confidentiality, integrity, and availability impact. Microsoft has released a patch via MSRC. CRITICAL 9.8 7.0% 142
KEV PoC
CVE-2026-50751 Authentication bypass in Check Point Quantum Security Gateway and Spark Firewalls allows unauthenticated remote attackers to establish Remote Access and Mobile Access VPN sessions without valid credentials by abusing a logic flaw in deprecated IKEv1 certificate validation. The flaw (CVSS 9.3, CWE-287) was reported by Check Point themselves and publicly available exploit code exists, though EPSS exploitation probability remains very low (0.01%) and the issue is not currently listed in CISA KEV. Affected deployments include multiple Quantum R80.40-R82.10 trains and Spark R80.20.X-R82.00.X firmware. CRITICAL 9.3 0.0% 137
KEV PoC No patch
CVE-2025-13316 Twonky Server 8.5.2 uses hard-coded cryptographic keys for encrypting the administrator password. Combined with the credential exposure vulnerability (CVE-2025-13315), this allows attackers to decrypt the admin password from the leaked log file and gain full administrative control of the media server. HIGH 8.2 72.7% 134
PoC No patch
CVE-2026-33825 Privilege escalation in Microsoft Defender Antimalware Platform versions before 4.18.26030.3011 allows authenticated local attackers to gain elevated system privileges through insufficiently granular access controls. CVSS 7.8 (High) reflects local attack vector requiring low privileges. EPSS score of 0.04% (12th percentile) indicates low probability of widespread exploitation. Microsoft has released a patched version (4.18.26030.3011) addressing the access control deficiency. HIGH 7.8 0.0% 129
KEV PoC
CVE-2026-69836 Remote code execution in Microsoft Entra ID lets an unauthenticated network attacker run arbitrary code by submitting maliciously crafted serialized data that the service deserializes without validation (CWE-502). The CVSS 3.1 base score is a maximum 10.0 with a scope change, reflecting unauthenticated network reach and full compromise of confidentiality, integrity, and availability. There is no public exploit identified at time of analysis, and the issue is not listed in CISA KEV, but the combination of a cloud identity platform and PR:N/UI:N makes this an urgent-patch candidate. CRITICAL 10.0 1.4% 126
KEV PoC
CVE-2026-41091 Local privilege escalation in Microsoft Defender (Malware Protection Engine) enables an authenticated low-privileged attacker to elevate to SYSTEM by abusing improper link resolution (CWE-59) before file access. The flaw scores CVSS 7.8 with high impact to confidentiality, integrity, and availability, and no public exploit is identified at time of analysis. Microsoft has released a patch via MSRC, and there is no current CISA KEV listing or EPSS signal indicating active mass exploitation. HIGH 7.8 12.1% 126
KEV PoC
CVE-2026-20963 Microsoft Office SharePoint contains a deserialization vulnerability (CVE-2026-20963) that allows authenticated users to execute arbitrary code over the network through crafted serialized objects. KEV-listed with public PoC, this CVSS 8.8 vulnerability enables any SharePoint user to escalate to server-level code execution, making it a critical threat for organizations relying on SharePoint for document management and collaboration. CRITICAL 9.8 1.6% 126
KEV PoC
CVE-2026-45659 Authenticated remote code execution in Microsoft SharePoint (Enterprise Server 2016, Server 2019, and Subscription Edition) stems from unsafe deserialization of untrusted data (CWE-502), enabling an authorized attacker to run arbitrary code on the server over the network. CVSS 8.8 with low privileges required and no user interaction makes this attractive to post-authentication adversaries, though no public exploit identified at time of analysis and CVSS temporal data marks exploit code maturity as Unproven. HIGH 8.8 0.5% 125
KEV PoC
CVE-2025-11953 React Native Metro Development Server binds to external interfaces by default and contains an OS command injection endpoint, allowing unauthenticated network attackers to execute arbitrary code. CRITICAL 9.8 3.4% 122
KEV PoC
CVE-2026-42897 Cross-site scripting (XSS) in Microsoft Exchange Server enables remote attackers to spoof content and steal credentials without authentication. Affects Exchange Server 2016 CU23, 2019 CU14/CU15, and Subscription Edition. Functional exploit code exists (CVSS temporal E:F) though no active exploitation confirmed at analysis time. CVSS 8.1 (High) driven by network vector, no authentication requirement, and dual confidentiality/integrity impact. Microsoft released patches via MSRC security update guide. Medium-high priority for organizations running affected Exchange versions with webmail or OWA exposed. MEDIUM 6.1 0.2% 121
KEV PoC

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