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ScreenConnect Client (Ab)used by Attackers https://isc.sans.edu/diary/ScreenConnect+Client+Abused+by+Attackers/33388/#comments Attackers abuse ChatGPT to deliver RAT via ClickFix https://www.huntress.com/blog/chatgpt-custom-gpts-clickfix-rat?_sp=51406044-aa1d-4278-a4e7-adb5b8ef84b2.1790890760100 Spoofing iCloud From Address https://sec-consult.com/blog/detail/from-anyoneicloudcom-spoofing-arbitrary-apple-icloud-identities/ Sender spoofing in Proton Mail via display-name homograph https://alonsovidales.github.io/protonmail-sender-spoofing/ My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

Cisco Catalyst SD-WAN Manager API Authentication Bypass Vulnerability CVE-2026-76504 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-webauth-xr8beuuU WatchGuard AP Command Injection in Internal Management API Allows Command Execution https://psirt.watchguard.com/CVE-2026-86102/ A Realistic Code Execution Exploit Chain in OpenBao and Vault https://control-plane.io/posts/unauthed-to-rce-in-vault-and-openbao/ Building a post-quantum certificate authority with Merkle Tree Certificates https://blog.cloudflare.com/pq-ca-with-mtcs/ My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

Scans for Wordfence Protected Websites https://isc.sans.edu/diary/Scans%20for%20Wordfence%20Protected%20Websites/33382 MikroTik RouterOS Vulnerability (CVE-2026-84411) https://www.cisa.gov/news-events/ics-advisories/icsa-26-272-06 Poper Blocker: The Adblocker That Spies on You https://amibeingpwned.com/blog/poper-blocker-the-adblocker-that-spies-on-you My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

Apple Emergency Patch for iOS 26, macOS26, macOS15 (CVE-2026-86950) https://isc.sans.edu/diary/Apple%20Emergency%20Patch%20for%20iOS%2026%2C%20macOS26%2C%20macOS15%20%28CVE-2026-86950%29/33376 https://support.apple.com/en-us/100100 Proof of concept for macOS CoreServices Priv. Escalation (CVE-2026-43786) https://github.com/Malwation/CVE-2026-43786 NeedyMantis: Unpacking a post-compromise malware family used in targeted operations https://www.microsoft.com/en-us/security/blog/2026/09/28/needymantis-unpacking-a-post-compromise-malware-family-used-in-targeted-operations/ File Notification Attacks https://inoti.fyi/pubs/file-notification-attacks.pdf My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

A Closer Look at Malware From the Macfinger ClickFix Campaign https://isc.sans.edu/diary/A%20Closer%20Look%20at%20Malware%20From%20the%20Macfinger%20ClickFix%20Campaign/33368 Citrix NetScaler ADC and Citrix NetScaler Gateway Security Bulletin for CVE-2026-88771 through CVE-2026-88778 https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778/ KiteWorks Urges Customers to Shut Down Servers https://www.heise.de/en/news/Imminent-Zero-Day-Attack-KiteWorks-Urges-Customers-to-Shut-Down-Servers-11466375.html ShinyHunters Renewed Mass Exploitation Campaign Targeting Oracle PeopleSoft https://cloud.google.com/blog/topics/threat-intelligence/shinyhunters-renewed-mass-exploitation-campaign-targeting-oracle-peoplesoft My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

One URL, Three Different Tricks https://isc.sans.edu/diary/33366 Send GitLab an email, push to main https://www.aikido.dev/blog/gitlab-email-push-to-main macOS MacSync Malware Update https://securelist.com/macsync-new-version/121383/ SolarWinds Observability Self-Hosted 2026.2.3 https://documentation.solarwinds.com/en/success_center/orionplatform/content/release_notes/hco_2026-2-3_release_notes.htm My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

Macfinger ClickFix Campaign https://isc.sans.edu/diary/Macfinger%20ClickFix%20campaign/33360 Graphalgo campaign spreads to Terraform providers and Go Modules https://www.aikido.dev/blog/graphalgo-terraform-go-modules MikroTik vulnerabilities technical analysis, https://cert.pl/en/posts/2026/09/mikrotrick-technical-analysis/ F5 Big-IP Vulnerability Details CVE-2026-94127 https://labs.watchtowr.com/is-this-a-joke-in-the-auth-header-f5-big-ip-unauth-heap-overflow-to-rce-cve-2026-94127/ My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

The Truth about GET and HTTP Standards https://isc.sans.edu/diary/The%20Truth%20about%20GET%20and%20HTTP%20Standards/33358 CVE-2026-93616: 0-Day Remote Code Execution Vulnerability patch in Checkpoint Management Server https://support.checkpoint.com/results/sk/sk1000171/ VeloCloud Orchestrator (VCO) Patch for Exploited Vulnerability CVE-2026-93952 https://www.arista.com/en/support/advisories-notices/security-advisory/24765-security-advisory-0183 F5 BigIP APM Exploited Vulnerability Patched CVE-2026-94127 https://my.f5.com/manage/s/article/K000162605 My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

TerminalFix PNG Steganography https://isc.sans.edu/diary/TerminalFix%3A%20PNG%20Steganography/33318 NPM Btree Malware Campaign Without Install Script https://checkmarx.com/zero-post/npm-btree-malware-campaign-affects-millions-of-downloads-no-need-for-install-script/ Pi-Hole Update and Advisory https://github.com/pi-hole/FTL/security/advisories/GHSA-2794-hrj8-5jg9 My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

HTTP QUERY Method: The Grey Zone Between GET and POST https://isc.sans.edu/diary/HTTP%20QUERY%20Method%3A%20The%20Grey%20Zone%20Between%20GET%20And%20POST./33352 Simple MacOS Docker Escape https://www.accomplish.ai/blog/escaping-dockers-hypervisor/ CVE-2026-77179 Brevo ClickFix Compromise https://status.brevo.com/incidents/01M2QBC4EZ24ZACW6SWQYVW8N3/write-up LastPass (and other) lookalike GitHub Repo and Kernel Module Infostealer https://blog.lastpass.com/posts/lastpass-delphos-report-rapuncel-infostealer My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

LausivLoader analysis, or how to pass data between malware stages https://isc.sans.edu/diary/LausivLoader%20analysis%2C%20or%20how%20to%20pass%20data%20between%20malware%20stages/33348 Issabel Framework Hard-coded JWT Key RCE CVE-2026-89026 https://www.vulncheck.com/advisories/issabel-pbx-hard-coded-jwt-key-rce-via-pbxapi-manager-originate Using Cyber Decoys to Strengthen Detection and Response https://www.cisa.gov/sites/default/files/2026-09/using-cyber-decoys-to-strengthen-detection-and-response_508c.pdf CISA to Sunset Weekly Vulnerability Bulletin on September 28, 2026 https://content.govdelivery.com/accounts/USDHSCISA/bulletins/42b055b Unbound Vulnerability https://nlnetlabs.nl/projects/unbound/security-advisories/ My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

Scans Targeting Hospitality Applications https://isc.sans.edu/diary/Scans%20Targeting%20Hospitality%20Applications/33344 Cisco Identity Services Engine Authentication Bypass Vulnerability CVE-2026-76460 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ISE-ABP-VNSW7Tn5 Acronis Local privilege escalation due to insecure file permissions CVE-2026-87886 https://security-advisory.acronis.com/advisories/SEC-10986 Pixel Update Bulletin September 2026 https://source.android.com/docs/security/bulletin/pixel/2026/2026-09-01 Dynamic Incident Response (Free E-Book) https://dynamicincidentresponse.com My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

MacOS 27 - First Boot https://isc.sans.edu/diary/MacOS%2027%20-%20First%20Boot/33340 Cisco Secure Email Gateway SQL Injection Vulnerability CVE-2026-76461 https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX Detecting and Mitigating Active Directory Compromises https://www.cisa.gov/resources-tools/resources/detecting-and-mitigating-active-directory-compromises Protecting Tokens and Assertions from Forgery, Theft, and Misuse https://nvlpubs.nist.gov/nistpubs/ir/2026/NIST.IR.8587.pdf My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

Apple Updates Everything https://isc.sans.edu/diary/Apple%20Updates%20Everything/33336 Homebrew 7 Released https://brew.sh/2026/09/13/homebrew-7.0.0/ Microsoft Out-of-Band Patch https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update Telegram XSS Vulnerability https://expatch.com/writeups/telegram-html-export-xss.html My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich

The Self-Expanding Stolen Inference Supply Chain: An AI Agent Harvesting and Re-Serving LLM Access https://isc.sans.edu/diary/The%20Self-Expanding%20Stolen%20Inference%20Supply%20Chain%3A%20An%20AI%20Agent%20Harvesting%20and%20Re-Serving%20LLM%20Access/33332 CVE-2026-0310 PAN-OS: Buffer Overflow Vulnerability via XML Processing https://security.paloaltonetworks.com/CVE-2026-0310 OpenAI agents carried out an undisclosed cyber-attack on RubyGems https://www.rubyhack.ai Passkey-themed social engineering leads to identity and cloud compromise https://www.microsoft.com/en-us/security/blog/2026/09/09/passkey-themed-social-engineering-leads-identity-cloud-compromise/ My Upcoming Classes https://www.sans.org/profiles/dr-johannes-ullrich