Tag Archives: ActiveDirectory

July Microsoft Patch Tuesday

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July Microsoft Patch Tuesday

July Microsoft Patch Tuesday. In the second week of July, I was on vacation in St. Petersburg. After that, I got caught up with a bunch of other tasks, so I'm only publishing this roundup now. Better late than never, especially considering how unusual this MSPT turned out to be. 😉 In total, 571 vulnerabilities were addressed - almost three times (❗️) more than in June. There are four vulnerabilities that have been reported as exploited in the wild:

🔻 RCE - Microsoft SharePoint (CVE-2026-58644). An attacker with Site Owner privileges or higher can remotely inject and execute arbitrary code on the SharePoint Server.

🔻 RCE - Microsoft SharePoint (CVE-2026-50522). The vulnerability description is identical to CVE-2026-58644. According to ZDI, the CVE-2026-50522 vulnerability was successfully demonstrated at Pwn2Own Berlin. Despite this, Microsoft rates its Exploit Maturity as "Unknown", even though researchers have already provided a working exploit to the company. This once again shows that organizations should not rely solely on software vendors' assessments and should instead perform their own risk evaluation. If you have Internet-facing SharePoint servers, you should test and deploy the patch addressing this vulnerability as soon as possible.

🔻 EoP - Microsoft SharePoint Server (CVE-2026-56164). Missing authentication for a critical function in Microsoft Office SharePoint could allow an unauthenticated attacker to elevate privileges over a network. Microsoft mentioned in the advisory that enabling the Antimalware Scan Interface (AMSI) on the server and setting the Request Body Scan mode to Full can help mitigate this flaw.

🔻 EoP - Active Directory Federation Services (CVE-2026-56155). Insufficient granularity of access control (CWE-1220) in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally. An attacker who successfully exploited this vulnerability could gain administrator privileges.

There are eight more vulnerabilities with publicly available exploits:

🔸 EoP - Windows User Interface Core (CVE-2026-50454). Relative path traversal (CWE-23) allows an authorized attacker to elevate privileges locally. An attacker who successfully exploited this vulnerability could gain SYSTEM privileges. The PoC starts from a normal, non-elevated process belonging to a local administrator and opens an interactive command prompt as NT AUTHORITY\SYSTEM.

🔸 EoP - Windows WalletService (CVE-2026-49176). Improper privilege management (CWE-269) allows an authorized attacker to elevate privileges locally. The exploit PoC starts a command prompt as SYSTEM in the active desktop session.

🔸 RCE - Microsoft Message Queuing Queue Manager (CVE-2026-54992). The existing exploit PoC demonstrates denial of service; it does not demonstrate code execution.

🔸 EoP - Windows Narrator Braille (CVE-2026-58635). According to Microsoft's description, an attacker who successfully exploited this vulnerability could execute code in the security context of the NT AUTHORITY\Network Service account. However, the description of the exploit PoC states that an unprivileged attacker would gain NT AUTHORITY\SYSTEM privileges.

🔸 EoP - Windows Cloud Files Mini Filter Driver (CVE-2026-58613). Use after free (CWE-416) in the Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally. An attacker who successfully exploits this vulnerability can gain SYSTEM privileges. Exploitation details are available in the Talos Vulnerability Report TALOS-2026-2426.

🔸 InfDisc - Windows Win32k (CVE-2026-50416). An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory. The exploit PoC description mentions Chrome tabs, Discord, Explorer, Spotify, and tray windows. However, it seems that it will not be possible to intercept passwords using this vulnerability.

🔸 InfDisc - Windows Kernel (CVE-2026-50475). A buffer over-read (CWE-126) in the Windows Kernel allows an authorized attacker to disclose information locally. Exploitation details are available in the Talos Vulnerability Report TALOS-2026-2443.

🔸 EoP - Azure Spring Apps (CVE-2026-50338). An attacker who successfully exploited this vulnerability could gain elevated privileges, potentially allowing them to perform actions beyond their original permissions. According to the author of the exploit PoC, the vulnerability is a Spring Cloud Azure B2C resource server cross-issuer authentication bypass.

Among the remaining vulnerabilities, the following can be highlighted:

🔹 RCE - Windows Remote Desktop Protocol (CVE-2026-56190). An unauthenticated, network-reachable, no user interaction required vulnerability. The root cause is a classic one: the use of an uninitialized resource (CWE-908), meaning specially crafted RDP traffic can interact with memory that was never properly initialized, letting an attacker corrupt memory and potentially steer code execution. RDP Servers are a common target, so audit your systems to see which are internet accessible and start from there.

🔹 RCE - Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) (CVE-2026-55944). Successful exploitation can be achieved by sending a crafted login request to an affected Dynamics NAV or Business Central server in order to trigger a deserialization of untrusted data vulnerability. Microsoft's advisory cautions that no user-interaction is required, nor is authentication a requirement in order to successfully exploit this vulnerability.

🔹 EoP - Microsoft Windows VMSwitch (CVE-2026-57092). It's a use-after-free that lets a low-privileged attacker escalate to full host compromise across a VM boundary. ZDI reported that a similar exploit was demonstrated on ESXi at Pwn2Own Berlin, but this issue is not limited to ESXi. If you use VMSwitch in Hyper-V deployments (which is likely), test and deploy the fix quickly.

🔹 Spoofing - Microsoft Exchange (CVE-2026-55008). An attacker can send a specially crafted email that runs arbitrary JavaScript when the victim opens it in OWA. No attachment or macro is required - simply viewing the email is enough. If your organization uses OWA, it is recommended to test and deploy the fix as soon as possible.

🔹 RCE - Windows DHCP Server (CVE-2026-50518, CVE-2026-56159, CVE-2026-48564, CVE-2026-50370), Windows DHCP Client (CVE-2026-54128), Windows Message Queuing Service (MSMQ) (CVE-2026-50447), Windows Admin Center (WAC) (CVE-2026-56196), Windows FTP Service (CVE-2026-49172), Windows GDI+ (CVE-2026-50380), Windows Server Network driver (CVE-2026-56188), Microsoft Exchange (CVE-2026-55005), Windows Active Directory Domain Services (CVE-2026-49178), Windows Remote Desktop Client (CVE-2026-50474), Windows Remote Desktop Client (CVE-2026-54990, CVE-2026-58594), Windows TCP/IP (CVE-2026-54999), Windows Print Spooler (CVE-2026-58608), Windows Reliable Multicast Transport Driver (RMCAST) (CVE-2026-54982, CVE-2026-54995), Microsoft SQL Server (CVE-2026-54117), Microsoft Copilot (CVE-2026-48561).

🔹 SFB - Microsoft SharePoint Server (CVE-2026-55040).

🔹 EoP - Windows Server Update Service (WSUS) (CVE-2026-50444), Active Directory Certificate Services (CVE-2026-54121).

There is also a rather curious vulnerability:

RCE - Game: Age of Empires II: Definitive Edition (CVE-2026-50663). 😃 A relative path traversal in Age of Empires II: Definitive Edition Game allows an unauthorized attacker to execute code over a network. Age of Empires II is a cult classic real-time strategy game by Microsoft, set in the medieval era. Players develop chosen civilizations, manage resources, research technologies, and command armies in historical campaigns and multiplayer battles. The Definitive Edition features improved graphics, updated audio, and additional content. If you're still playing this game, be sure to update. 😉

🗒 Full Vulristics Report

May Microsoft Patch Tuesday

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May Microsoft Patch Tuesday

May Microsoft Patch Tuesday. A total of 119 vulnerabilities, approximately 1.5 times fewer than in April. There are currently no vulnerabilities marked as actively exploited in the wild. However, there is one vulnerability with a public exploit:

🔸 EoP - Windows Kernel (CVE-2026-40369). A detailed write-up and exploit for this vulnerability were published on May 14, two days after the May MSPT. The researcher describes exploitation of the vulnerability as follows: "A single syscall from any unprivileged process — including inside Chrome's renderer sandbox — can increment arbitrary kernel memory addresses. No race conditions. No heap spray. No special tokens. 100% deterministic privilege escalation to SYSTEM."

Among the remaining ones, the following stand out:

🔹 RCE - Windows DNS Client (CVE-2026-41096). A ZDI analyst commented on this vulnerability as follows: "This patch fixes a heap-based buffer overflow in the DNS Client triggered by a malicious DNS response. No authentication or user interaction needed, and since the DNS Client runs on virtually every Windows machine, the attack surface is enormous. An attacker with a position to influence DNS responses (MitM, rogue server) could achieve unauthenticated RCE across your enterprise."

🔹 RCE - Windows Netlogon (CVE-2026-41089). The vulnerability allows an unauthenticated remote attacker to execute arbitrary code on a domain controller by sending a specially crafted network request. Exploitation does not require credentials or user interaction, which classifies this vulnerability as wormable. Compromise of a domain controller means full compromise of the organization's entire domain. A Rapid7 analyst added in their commentary: "No privileges or user interaction are required, and attack complexity is low, which suggests that creation of a reliable exploit might not be especially difficult for anyone with knowledge of the specific mechanism. Microsoft assesses exploitation as less likely, but since those exploitability assessments are provided without an accompanying explanation, it's not clear how much reassurance defenders should take. Anyone who remembers the much-discussed CVE-2020-1472 (aka ZeroLogon) back in 2020 will note that CVE-2026-41089 offers an attacker more immediate control of a domain controller. Patches are available for all versions of Windows Server from 2012 onwards."

🔹 RCE - Windows TCP/IP (CVE-2026-40415). Commentary from a ZDI analyst: "This bug in the TCP/IP stack results from a use-after-free (UAF) and could allow a remote, unauthenticated threat actor to execute code without user interaction. That makes this another wormable bug. However, this one is much less likely to be exploited. The target needs to be under sustained low-memory (memory pressure) conditions, which is pretty rare."

🔹 RCE - Microsoft Word (CVE-2026-40361, CVE-2026-40364, CVE-2026-40366, CVE-2026-40367). An attacker can exploit these vulnerabilities through social engineering by sending a malicious file to a targeted victim. Successful exploitation would grant the attacker arbitrary code execution. Microsoft researchers note that the Preview Pane is an attack vector for each of these vulnerabilities.

🔹 RCE - Microsoft Office (CVE-2026-40363, CVE-2026-42831). A heap-based buffer overflow vulnerability in Microsoft Office may allow an unauthorized attacker to remotely execute arbitrary code.

🔹 RCE - Windows GDI (CVE-2026-35421). A heap-based buffer overflow vulnerability in the Windows GDI component may allow an unauthorized attacker to remotely execute arbitrary code.

🔹 RCE - Microsoft Dynamics 365 On-Premises (CVE-2026-42898). Commentary from a ZDI analyst: "It allows any authenticated user to execute code with a scope change, meaning exploitation can break out and affect resources beyond the vulnerable component itself. Scope changes are pretty rare, so if you're running Dynamics 365 On-Prem, definitely test and deploy this patch quickly."

🔹 EoP - Windows Kernel (CVE-2026-33841, CVE-2026-35420, CVE-2026-40369). CVE-2026-33841 and CVE-2026-40369 are rated "Exploitation More Likely". A local attacker can use these vulnerabilities to elevate privileges to SYSTEM level. In the case of CVE-2026-33841, the attacker can elevate privileges to Medium/High integrity level.

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April Microsoft Patch Tuesday

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April Microsoft Patch Tuesday

April Microsoft Patch Tuesday. A total of 167 vulnerabilities, about twice as many as in March. There is one vulnerability already being exploited in the wild:

🔻 Spoofing - Microsoft SharePoint Server (CVE-2026-32201). ZDI experts say "Spoofing bugs in SharePoint often manifest as cross-site scripting (XSS) bugs". "An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality), make changes to disclosed information (Integrity), but cannot limit access to the resource (Availability)". There is no info yet about how widely it is being used in attacks, but you should not delay patching, especially if SharePoint is exposed to the Internet.

Formally, there are no public exploits yet. However, there are strong indications that a public exploit may already exist for one vulnerability.

🔸 EoP - Microsoft Defender (CVE-2026-33825). "Insufficient granularity of access control" in Microsoft Defender allows a logged-in attacker to gain higher privileges on a local system. Tenable and ZDI say the bug looks similar to the BlueHammer zero-day, for which a public exploit was released on GitHub on April 3. The researcher who published it, Chaotic Eclipse, criticized Microsoft’s disclosure process. ZDI says the exploit is real, but exploitation is unstable and not always reliable.

Other important issues:

🔹 RCE - Windows Active Directory (CVE-2026-33826). To exploit this, the attacker must have an account. The attacker sends a specially crafted RPC request to a vulnerable server, which can lead to code execution. Microsoft says the attacker must be in the same restricted Active Directory domain as the target system.

🔹 RCE - Windows Internet Key Exchange (IKE) Service Extensions (CVE-2026-33824). ZDI says this vulnerability is wormable, meaning it could allow malware to spread automatically between systems. It affects systems with IKE enabled, which creates a large attack surface. Microsoft recommends blocking UDP ports 500 and 4500 at the network edge. However, attackers inside the network can still use it for lateral movement. Patch quickly if you use IKE.

🔹 RCE - Windows TCP/IP (CVE-2026-33827). ZDI also says this may be wormable, especially on systems using IPv6 and IPSec. A race condition makes it harder to exploit, but similar bugs are often exploited at Pwn2Own, so you should not rely on that difficulty. If you use IPv6, test and deploy the patch quickly before exploits appear.

🔹 EoP - Windows Push Notifications (CVE-2026-26167). This Patch Tuesday includes several sandbox escape vulnerabilities, including in Push Notifications, AFD for Winsock, Windows Management Services, and User Interface Core. CVE-2026-26167 (Push Notifications) is the most important because it is the only one with low attack complexity. The others require winning a race condition (AC:H).

🔹 Spoofing - Remote Desktop (CVE-2026-26151). Weak warnings in the Remote Desktop interface allow a network attacker to trick a user into opening a specially crafted file, leading to spoofing. The issue was found by the UK National Cyber Security Centre (NCSC).

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Microsoft Patch Tuesday August 2022: DogWalk, Exchange EOPs, 13 potentially dangerous, 2 funny, 3 mysterious vulnerabilities

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Microsoft Patch Tuesday August 2022: DogWalk, Exchange EOPs, 13 potentially dangerous, 2 funny, 3 mysterious vulnerabilities. Hello everyone! In this episode, let’s take a look at the Microsoft Patch Tuesday August 2022 vulnerabilities. I use my Vulristics vulnerability prioritization tool as usual. I take comments for vulnerabilities from Tenable, Qualys, Rapid7, ZDI and Kaspersky blog posts. Also, as usual, I take into account the vulnerabilities added between the July and August Patch Tuesdays.

Alternative video link (for Russia): https://vk.com/video-149273431_456239098

There were 147 vulnerabilities. Urgent: 1, Critical: 0, High: 36, Medium: 108, Low: 2.

There was a lot of great stuff this Patch Tuesday. There was a critical exploited in the wild MSDT DogWalk vulnerability, 3 critical Exchange vulnerabilities that could be easily missed in prioritization, 13 potentially dangerous vulnerabilities, 2 funny vulnerabilities and 3 mysterious ones. Let’s take a closer look.

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