SANS Stormcast: Daily Cyber Security News

Odd WebLogic Request. Possible CVE-2026-21962 Exploit Attempt or AI Slop? We are seeing attempts to attack CVE-2026-21962, a recent weblog vulnerability, using a non-working AI slop exploit https://isc.sans.edu/diary/Odd%20WebLogic%20Request.%20Possible%20CVE-2026-21962%20Exploit%20Attempt%20or%20AI%20Slop%3F/32662 Fortinet Patches are Rolling Out Fortinet is starting to roll out patches for the r...

Initial Stages of Romance Scams [Guest Diary] Romance scams often start with random text messages that appear to be misrouted . This guest diary by Faris Azhari is following some of the initial stages of such a scam. https://isc.sans.edu/diary/Initial%20Stages%20of%20Romance%20Scams%20%5BGuest%20Diary%5D/32650 Denial of Service Vulnerabilities in React Server Components Another folowup fix for the...

Scanning Webserver with pwd as a Starting Path Attackers are adding the output of the pwd command to their web scans. https://isc.sans.edu/diary/x/32654 Microsoft Office Security Feature Bypass Vulnerability CVE-2026-21509 Microsoft released an out-of-band patch for Office fixing a currently exploited vulnerability. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509 Exposed Clawd...

Analysis of Single Sign-On Abuse on FortiOS Fortinet released an advisory. FortiOS devices are vulnerable if configured with any SAML integration, not just FortiCloud https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios Outlook OOB Update Microsoft released a non-security OOB Update for Outlook, fixing an issue introduced with this months security patches. https://support.mic...

Is AI-Generated Code Secure? Xavier used the free static code analysis tool Bandit to review code he wrote with heavy AI support. https://isc.sans.edu/diary/Is%20AI-Generated%20Code%20Secure%3F/32648 Malicious Configuration Changes On Fortinet FortiGate Devices via SSO Accounts Arctic Wolf summarized some of the attacks it is seeing against FortiGate devices via the insufficiently patched SSL vuln...

Automatic Script Execution In Visual Studio Code Visual Studio Code will read configuration files within the source code that may lead to code execution. https://isc.sans.edu/diary/Automatic%20Script%20Execution%20In%20Visual%20Studio%20Code/32644 Cisco Unified Communications Products Remote Code Execution Vulnerability A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Un...

Add Punycode to your Threat Hunting Routine Punycode patterns in DNS queries make excellent hunting opportunities. https://isc.sans.edu/diary/Add%20Punycode%20to%20your%20Threat%20Hunting%20Routine/32640 GNU InetUtils Security Advisory: remote authentication by-pass intelnetd telnetd shipping with InetUtils suffers from a critical authentication by-pass vulnerability. https://www.openwall.com/list...

"How many states are there in the United States?" Attackers are actively scanning for LLMs, fingerprinting them using the query How many states are there in the United States? . https://isc.sans.edu/diary/%22How%20many%20states%20are%20there%20in%20the%20United%20States%3F%22/32618 Closing the Door on Net-NTLMv1: Releasing Rainbow Tables to Accelerate Protocol Deprecation Mandiant is publicly rele...

Battling Cryptojacking, Botnets, and IABs Cryptojacking often comes with less obvious addons, like SSH backdoors https://isc.sans.edu/diary/Battling%20Cryptojacking%2C%20Botnets%2C%20and%20IABs%20%5BGuest%20Diary%5D/32632 Microsoft Copilot Reprompt Attacks Adding a query parameter to the URL may prefill a Copilot prompt, altering the meaning of the prompts that follow. https://www.varonis.com/blog...

Infection repeatedly adds scheduled tasks and increases traffic to the same C2 domain https://isc.sans.edu/diary/Infection%20repeatedly%20adds%20scheduled%20tasks%20and%20increases%20traffic%20to%20the%20same%20C2%20domain/32628 BodySnatcher (CVE-2025-12420): A Broken Authentication and Agentic Hijacking Vulnerability in ServiceNow https://appomni.com/ao-labs/bodysnatcher-agentic-ai-security-vulne...

Microsoft Patch Tuesday January 2026 Microsoft released patches for 113 vulnerabilities. This includes one already exploited vulnerability, one that was made public before today and eight critical vulnerabilities. https://isc.sans.edu/diary/January%202026%20Microsoft%20Patch%20Tuesday%20Summary/32624 Adobe Patches Adobe released patches for five products. The code execution vulnerabilities in Cold...

n8n supply chain attack Malicious npm pagackages were used to attempt to obtain user OAUTH credentials for NPM. https://www.endorlabs.com/learn/n8mare-on-auth-street-supply-chain-attack-targets-n8n-ecosystem Gogs 0-Day Exploited in the Wild An at the time unpachted flaw in Gogs was exploited to compromise git repos. https://www.wiz.io/blog/wiz-research-gogs-cve-2025-8110-rce-exploit Telegram Proxy...

Malicious Process Environment Block Manipulation The process environment block contains metadata about particular processes, but can be manipulated. https://isc.sans.edu/diary/Malicious+Process+Environment+Block+Manipulation/32614/ YARA-X 1.11.0 Release: Hash Function Warnings The latest version of YARA will warn users if a hash rule attempts to match an invalid hash. https://isc.sans.edu/diary/YA...

Analysis using Gephi with DShield Sensor Data Gephi is a neat tool to create interactive data visualizations. It can be applied to honeypot data to find data clusters. https://isc.sans.edu/diary/Analysis%20using%20Gephi%20with%20DShield%20Sensor%20Data/32608 zlib v1.3.1.2 Global Buffer Overflow in TGZfname() of zlib untgz Utility The untgz utility that is part of zlib suffers from a straightforwar...

A phishing campaign with QR codes rendered using an HTML table Phishing emails are bypassing filters by encoding QR codes as HTML tables. https://isc.sans.edu/diary/A%20phishing%20campaign%20with%20QR%20codes%20rendered%20using%20an%20HTML%20table/32606 n8n vulnerabilities In recent days, several new n8n vulnerabilities were disclosed. Ensure that you update any on-premises installations and caref...

Tool Review: Tailsnitch Tailsnitch is a tool to audit your Tailscale configuration. It does a comprehensive analysis of your configuration and suggests (or even applies) fixes. https://isc.sans.edu/diary/Tool%20Review%3A%20Tailsnitch/32602 D-Link DSL Command Injection via DNS Configuration Endpoint A new vulnerability in very old D-Link DSL modems is currently being exploited. https://www.vulnchec...

Risks of OOB Access via IP KVM Devices Recently, cheap IP KVMs have become popular. But their deployment needs to be secured. https://isc.sans.edu/diary/Risks%20of%20OOB%20Access%20via%20IP%20KVM%20Devices/32598 Tailsnitch Tailsnitch is a tool to review your Tailscale configuration for vulnerabilities https://github.com/Adversis/tailsnitch Net-SNMP snmptrapd vulnerability A new vulnerability in sn...

Cryptocurrency Scam Emails and Web Pages As We Enter 2026 Scam emails are directing victims to confidence scams attempting to steal cryptocurrencies. https://isc.sans.edu/diary/Cryptocurrency%20Scam%20Emails%20and%20Web%20Pages%20As%20We%20Enter%202026/32594 Debugging DNS response times with tshark tshark is a powerful tool to debug DNS timing issues. https://isc.sans.edu/diary/Debugging+DNS+respo...

MongoDB Unauthenticated Attacker Sensitive Memory Leak CVE-2025-14847 Over the Christmas holiday, MongoDB patched a sensitive memory leak vulnerability that is now actively being exploited https://www.mongodb.com/community/forums/t/important-mongodb-patch-available/332977 https://github.com/mongodb/mongo/commit/505b660a14698bd2b5233bd94da3917b585c5728 https://www.ox.security/blog/attackers-could-e...

DLLs & TLS Callbacks As a follow-up to last week's diary about DLL Entrypoints, Didier is looking at TLS ( Thread Local Storage ) and how it can be abused. https://isc.sans.edu/diary/DLLs%20%26%20TLS%20Callbacks/32580 FreeBSD Remote code execution via ND6 Router Advertisements A critical vulnerability in FreeBSD allows for remote code execution. But an attacker must be on the same network. htt...

Positive trends related to public IP range from the year 2025 Fewer ICS systems, as well as fewer systems with outdated SSL versions, are exposed to the internet than before. The trend isn t quite clean for ISC, but SSL2 and SSL3 systems have been cut down by about half. https://isc.sans.edu/diary/Positive%20trends%20related%20to%20public%20IP%20ranges%20from%20the%20year%202025/32584 Hewlett-Pack...

Maybe a Little Bit More Interesting React2Shell Exploit Attackers are branching out to attack applications that initial exploits may have missed. The latest wave of attacks is going after less common endpoints and attempting to exploit applications that do not have Next.js exposed. https://isc.sans.edu/diary/Maybe%20a%20Little%20Bit%20More%20Interesting%20React2Shell%20Exploit/32578 UAT-9686 activ...

Beyond RC4 for Windows authentication Microsoft outlined its transition plan to move away from RC4 for authentication and published guidance and tools to facilitate this change. https://www.microsoft.com/en-us/windows-server/blog/2025/12/03/beyond-rc4-for-windows-authentication FortiCloud SSO Login Vuln Exploited Arctic Wolf observed exploit attempts against vulnerable FortiGate appliances. https:...

More React2Shell Exploits CVE-2025-55182 Our honeypots continue to detect numerous React2Shell variants. Some using slightly modified exploits https://isc.sans.edu/diary/More%20React2Shell%20Exploits%20CVE-2025-55182/32572 The Fragile Lock: Novel Bypasses For SAML Authentication SAML is a tricky protocol to implement correctly, in particular if different XML parsers are used that may not always ag...

Abusing DLLs EntryPoint for the Fun DLLs will not just execute code when some of their functions are called, but also as they are loaded. https://isc.sans.edu/diary/Abusing%20DLLs%20EntryPoint%20for%20the%20Fun/32562 Apple Patches Everything: December 2025 Edition Apple released patches for all of its operating systems, fixing two already exploited vulnerabilities. ClickFix Attacks Still Using the...