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VMware Patches Multiple vCenter Server Vulnerabilities (CVE-2
VMware Patches Multiple vCenter Server Vulnerabilities (CVE-2021-21985, CVE-2021-21986) On May 25, VMware published an advisory (VMSA-2021-0010) regarding two vulnerabilities impacting vCenter Server, a centralized management software for VMware vSphere systems. In a rare move, VMware also published a blog post providing guidance on how users can mitigate these vulnerabilities. Organizations are strongly encouraged to apply patches as soon as possible. For more information about these vulnerabilities, including the availability of patches and Tenable product coverage, please visit our blog.
Microsoft’s June 2026 Patch Tuesday Addresses 198 CVEs
On June 9, Microsoft released its June 2026 Patch Tuesday release which patched 198 CVEs with 32 rated as critical and 166 rated as important. This month's updates included three zero-days that were publicly disclosed prior to patches being made available. This Patch Tuesday release is the largest release since the Patch Tuesday program began, smashing the previous record of 167 CVEs in the October 2025 Patch Tuesday release. One of the zero-days is CVE-2026-50507, a security feature bypass vulnerability affecting Windows BitLocker. It received a CVSSv3 score of 6.8 and is rated as important. According to Microsoft, an attacker with physical access to the system could bypass the BitLocker Device Encryption feature in order to gain access to the device's encrypted data. This vulnerability appears to be the flaw known as Bitskrieg and a collaboration between Chaotic Eclipse (Nightmare Eclipse) and Jonas L. Chaotic Eclipse or Nightmare Eclipse has published several additional zero-days recently, including BlueHammer (CVE-2026-33825), GreenPlasma, MiniPlasma and YellowKey (CVE-2026-45585). This month’s update includes patches for: .NET ASP.NET Core Active Directory Domain Services Azure HorizonDB Azure Stack Edge Copilot Chat (Microsoft Edge) Function Discovery Service (fdwsd.dll) GitHub Copilot and Visual Studio Code HTTP/2 Linux MANA Driver M365 Copilot Microsoft Azure Attestation service and Device Health Attestation Service Microsoft Azure Kubernetes Service Microsoft Bing Microsoft Copilot Microsoft Defender for Endpoint Microsoft Dynamics 365 (on-premises) Microsoft Exchange Online Microsoft Exchange Server Microsoft Graph Microsoft Graphics Component Microsoft Kinect Microsoft Live Share Canvas SDK Microsoft Office Microsoft Office Click-To-Run Microsoft Office Excel Microsoft Office Project Microsoft Office SharePoint Microsoft Office Word Microsoft PC Manager Microsoft PowerToys Microsoft Teams for Android Microsoft UxTheme Library (uxtheme.dll) Microsoft Windows DNS Nuance PowerScribe Office for Android Remote Desktop Client Role: Windows Hyper-V UI Automation Manager (uiamanager.dll) Universal Plug and Play (upnp.dll) Visual Studio Code Windows Administrator Protection Windows Ancillary Function Driver for WinSock Windows Application Identity (AppID) Subsystem Windows BitLocker Windows Bluetooth Port Driver Windows Bluetooth Service Windows Boot Manager Windows Collaborative Translation Framework Windows Common Log File System Driver Windows Cryptographic Services Windows DHCP Client Windows DHCP Server Windows DWM Core Library Windows Deployment Services Windows HTTP.sys Windows Hotpatch Monitoring Service Windows Hyper-V Windows Internet (wininet.dll) Windows Kerberos Windows Kernel Windows Kernel-Mode Drivers Windows Mark of the Web (MOTW) Windows Media Windows NT OS Kernel Windows NTFS Windows Narrator Braille Windows Network Controller (NC) Host Agent Windows Performance Monitor Windows Program Compatibility Assistant Service Windows Projected File System Filter Driver Windows Push Notifications Windows RDP Windows SDK Windows Secure Boot Windows Shell Windows Storage Windows TCP/IP Windows Telephony Service Windows UEFI Windows Universal Disk Format File System Driver (UDFS) Windows Win32K - GRFX Winlogon For more information, please visit our blog.Key findings from the Verizon DBIR 2026: Slower vulnerability remediation meets faster exploitation
Verizon’s annual Data Breach Investigations Report (DBIR) has helped organizations understand evolving cyber threats since its first release in 2008. For the 2026 edition, Tenable Research once again contributed enriched data on vulnerability exploitation and vulnerability remediation trends. This year’s findings paint a stark picture: Compared with last year, organizations are facing a significant increase in the volume of “must-patch” vulnerabilities from the Cybersecurity and Infrastructure Security Agency’s (CISA) Known Exploited Vulnerabilities (KEV) catalog. The 2026 Verizon DBIR found that vulnerability exploitation is the top initial access vector, accounting for 31% of data breaches during the study period. Even more concerning is that the median time-to-patch has increased from 32 days to 43 days, a 34% increase. This year’s findings paint a stark picture: The number of vulnerabilities continues to snowball, as organizations’ patching rates continue to fall behind. While vulnerability exploitation dominates headlines as the number one initial access vector, it represents only a slice of the exposure problem. The DBIR notably highlights credential abuse as another significant threat vector, underscoring that vulnerabilities don’t exist in isolation. Stolen credentials can transform a moderate-severity vulnerability into a critical breach pathway, while exposed configurations can provide attackers with the access needed to exploit unpatched systems. This interconnected nature of exposures highlights why more and more organizations are adopting comprehensive exposure management. Understanding and addressing the full attack surface, including identity risks, misconfigurations, excessive permissions, and vulnerable assets, is essential to reducing breach risk in today’s threat landscape. The 2026 DBIR, enriched with Tenable Research’s data, provides valuable insights into today’s threat landscape. Tenable encourages security professionals to read the full Verizon DBIR to understand current attack trends and use these findings to inform their exposure management strategies. In addition, please visit our blog for our analysis and insights into the Tenable data used in the DBIR report.Frequently Asked Questions About The August 2025 F5 Security Incident
Starting August 9 2025, F5 learned that a nation-state threat actor gained and maintained access to certain systems within their environment. This included access to F5’s BIG-IP product development systems and “engineering knowledge management platforms.” On October 15, F5 released knowledge base (KB) article K000154696 providing current details on the known impacts of the breach, including an acknowledgement that they have not observed further unauthorized activity and believe they have successfully contained the breach. In response, Tenable’s Research Special Operations (RSO) team has compiled a blog to answer Frequently Asked Questions (FAQ) regarding the security incident affecting F5. Alongside the disclosure of the security incident, F5 also released its October 2025 Quarterly Security Notification. While there is no notice in these security advisories that any of the CVEs released on October 15 have been exploited, we strongly recommend applying all available patches. For more information about the vulnerabilities, including the availability of patches and Tenable product coverage, please visit our blog.FAQ on the Axios npm Supply Chain Attack by North Korea-Nexus Threat Actor UNC1069
On March 31, a North Korea-nexus threat actor (UNC1069) compromised the axios npm package, one of the most widely used JavaScript libraries with over 100 million weekly downloads. The attacker published two malicious versions (1.14.1 and 0.30.4) containing a cross-platform remote access trojan tracked as WAVESHAPER.V2, targeting macOS, Windows and Linux developer environments. The malicious versions were live on the npm registry for approximately three hours before being removed. Google Threat Intelligence Group (GTIG) attributed the attack to UNC1069 based on malware lineage and infrastructure overlaps. Systems that installed the affected versions are considered fully compromised. Developers are advised to downgrade to [email protected] or 0.30.3, remove the phantom dependency (plain-crypto-js), rotate all secrets and rebuild affected systems. For more information about this supply chain attack, including IoCs, remediation guidance and Tenable product coverage, please visit our blog.Microsoft’s February 2026 Patch Tuesday Addresses 54 CVEs (CVE-2026-21510, CVE-2026-21513)
Microsoft’s February 2026 Patch Tuesday Addresses 54 CVEs (CVE-2026-21510, CVE-2026-21513) On February 10, Microsoft released its February 2026 Patch Tuesday release which patched 54 CVEs with two rated critical, 51 rated as important and one rated as moderate. This update included patches to address six zero-day vulnerabilities that were exploited in the wild including three of which were publicly disclosed prior to patches being made available. CVE-2026-21510 is a security feature bypass vulnerability affecting Windows Shell. It was assigned a CVSSv3 score of 8.8 and was rated as important. According to Microsoft, this flaw was publicly disclosed prior to a patch being made available and was also exploited in the wild as a zero-day. Exploitation requires an attacker to convince an unsuspecting user to open a malicious link or shortcut file. This would allow the attacker to bypass Windows SmartScreen and Windows Shell warnings by exploiting a flaw in Windows Shell components. CVE-2026-21533 is an elevation of privilege vulnerability affecting Windows Remote Desktop Services. It was assigned a CVSSv3 score of 7.8, rated as important and was reportedly exploited in the wild. Successful exploitation allows a local, authenticated attacker to elevate to SYSTEM privileges. This month’s update includes patches for: .NET .NET and Visual Studio Azure Arc Azure Compute Gallery Azure DevOps Server Azure Front Door (AFD) Azure Function Azure HDInsights Azure IoT SDK Azure Local Azure SDK Desktop Window Manager Github Copilot GitHub Copilot and Visual Studio Internet Explorer Mailslot File System Microsoft Defender for Linux Microsoft Edge for Android Microsoft Exchange Server Microsoft Graphics Component Microsoft Office Excel Microsoft Office Outlook Microsoft Office Word Power BI Role: Windows Hyper-V Windows Ancillary Function Driver for WinSock Windows App for Mac Windows Cluster Client Failover Windows Connected Devices Platform Service Windows GDI+ Windows HTTP.sys Windows Kernel Windows LDAP - Lightweight Directory Access Protocol Windows Notepad App Windows NTLM Windows Remote Access Connection Manager Windows Remote Desktop Windows Shell Windows Storage Windows Subsystem for Linux Windows Win32K - GRFX For more information, please visit our blog.CVE-2026-20127: Cisco Catalyst SD-WAN Controller/Manager Zero-Day Exploited in the Wild
On February 25, Cisco released a security advisory (cisco-sa-sdwan-rpa-EHchtZk) to address a maximum severity severity authentication bypass vulnerability in Cisco Catalyst SD-WAN Controller, formerly known as SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly known as SD-WAN vManage. CVE Description CVSSv3 CVE-2026-20127 Cisco Catalyst SD-WAN Controller/Manager Authentication Bypass Vulnerability 10.0 CVE-2026-20127 is a critical severity authentication bypass vulnerability in Cisco’s Catalyst SD-WAN Controller and Cisco Catalyst SD-WAN Manager. A remote, unauthenticated attacker could exploit this vulnerability by sending crafted requests to an affected system, allowing them to log into an affected device as a high-privileged user. Using this access, the attacker could modify network configurations for the SD-WAN fabric. According to the advisory, this vulnerability has been exploited in the wild in limited attacks. The advisory further clarifies that this flaw affects vulnerable versions regardless of the device's configuration and no workaround steps are available, however temporary mitigation guidance is available in the security advisory. For more information about the vulnerability, including the availability of patches and Tenable product coverage, please visit our blog.Investigating: Cl0p Reportedly Breached Oracle E-Business Suite (EBS) Systems
Tenable's Research Special Operations (RSO) team is investigating reports of breaches connected to Oracle E-Business Suite (EBS) systems by the Cl0p extortion group. As of October 3, there have been no specific vulnerabilities (or CVEs) identified in connection with the attacks. However, Rob Duhart, Chief Security Officer at Oracle, published the following in a blog post: Oracle is aware that some Oracle E-Business Suite (EBS) customers have received extortion emails. Our ongoing investigation has found the potential use of previously identified vulnerabilities that are addressed in the July 2025 Critical Patch Update. Oracle reaffirms its strong recommendation that customers apply the latest Critical Patch Updates. In the July 2025 Critical Patch Update (CPU), there were 165 unique CVEs patched, including nine associated with Oracle EBS: CVE Product CVSSv3 CVE-2025-30743 Oracle Lease and Finance Management 8.1 CVE-2025-30744 Oracle Mobile Field Service 8.1 CVE-2025-50105 Oracle Universal Work Queue 8.1 CVE-2025-50071 Oracle Applications Framework 6.4 CVE-2025-30746 Oracle iStore 6.1 CVE-2025-30745 Oracle MES for Process Manufacturing 6.1 CVE-2025-50107 Oracle Universal Work Queue 6.1 CVE-2025-30739 Oracle CRM Technical Foundation 5.5 CVE-2025-50090 Oracle Applications Framework 5.4 Cl0p has historically been linked to the exploitation of zero-day vulnerabilities including in managed file transfer platforms, such as Cleo, MOVEit, GoAnywhere and Accellion. If and when more definitive information becomes available, we will update this post and or publish more details on the Tenable Blog.Microsoft’s March 2026 Patch Tuesday Addresses 83 CVEs
Microsoft’s March 2026 Patch Tuesday Addresses 83 CVEs (CVE-2026-21262, CVE-2026-26127) On March 10, Microsoft released its March 2026 Patch Tuesday release which patched 83 CVEs with eight rated as critical and 75 rated as important, including two vulnerabilities that were publicly disclosed prior to a patch being released. CVE-2026-21262 is an elevation of privilege (EoP) vulnerability affecting Microsoft SQL Server. It received a CVSSv3 score of 8.8 and was rated as important. CVE-2026-21262 was publicly disclosed as a zero-day. While no exploitation has been reported by Microsoft, a successful exploit of this flaw would result in an attacker gaining SQL sysadmin privileges. In addition, two more CVEs were issued for EoP flaws in Microsoft SQL Server, CVE-2026-26115 and CVE-2026-26116. CVE-2026-26127 is a denial of service (DoS) vulnerability affecting .NET 9.0 and 10.0 on Windows, Mac OS and Linux. It received a CVSSv3 score of 7.5 and was rated as important. According to Microsoft, this vulnerability was publicly disclosed prior to patches being made available. Although it was publicly disclosed, Microsoft assesses that exploitation is unlikely for this DoS vulnerability. This month’s update includes patches for: .NET ASP.NET Core Active Directory Domain Services Azure Arc Azure Compute Gallery Azure Entra ID Azure IoT Explorer Azure Linux Virtual Machines Azure MCP Server Azure Portal Windows Admin Center Azure Windows Virtual Machine Agent Broadcast DVR Connected Devices Platform Service (Cdpsvc) Microsoft Authenticator Microsoft Brokering File System Microsoft Devices Pricing Program Microsoft Graphics Component Microsoft Office Microsoft Office Excel Microsoft Office SharePoint Payment Orchestrator Service Push Message Routing Service Role: Windows Hyper-V SQL Server System Center Operations Manager Windows Accessibility Infrastructure (ATBroker.exe) Windows Ancillary Function Driver for WinSock Windows App Installer Windows Authentication Methods Windows Bluetooth RFCOM Protocol Driver Windows DWM Core Library Windows Device Association Service Windows Extensible File Allocation Windows File Server Windows GDI Windows GDI+ Windows Kerberos Windows Kernel Windows MapUrlToZone Windows Mobile Broadband Windows NTFS Windows Performance Counters Windows Print Spooler Components Windows Projected File System Windows Resilient File System (ReFS) Windows Routing and Remote Access Service (RRAS) Windows SMB Server Windows Shell Link Processing Windows System Image Manager Windows Telephony Service Windows Universal Disk Format File System Driver (UDFS) Windows Win32K Winlogon For more information, please visit our blog.Mini Shai-Hulud: Frequently asked questions about the TeamPCP supply chain campaign
Between September 2025 and May 2026, a threat group tracked as TeamPCP has conducted a series of coordinated supply chain attacks across the npm and PyPI package ecosystems. The campaign, which the group calls Shai-Hulud, uses a self-propagating worm that steals developer and cloud credentials, then leverages those credentials to publish poisoned versions of additional packages. Each compromised continuous integration and continuous deployment (CI/CD) pipeline becomes a new distribution vector, enabling exponential spread. The current iteration is known as Mini Shai-Hulud. Tenable’s Research Special Operations Team (RSO) has compiled an FAQ blog to discuss what Mini Shai-Hulud is, how the campaign operates, who has been affected and what organizations should do to protect their software supply chains. For more information about the vulnerability, including the availability of patches and Tenable product coverage, please visit our blog.