Zero Day Initiative | Blog Note

Zero Day Initiative | Blog

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November 2026 brings substantial patches from both Microsoft and Adobe, with Adobe addressing 110 CVEs across nine products. The most critical Adobe patch is for Connect, fixing 24 CVEs, 18 of which are critical with a CVSS score of 10.0, requiring immediate attention. The Experience Manager also received a critical update, addressing 14 CVEs, including four critical bugs with a CVSS of 9.9. All other Adobe patches this month are Deployment Priority 3, with none reported as publicly known or under active exploit.Microsoft released approximately 1,090 new CVEs, a significant but slightly lower count than the previous month. Only one Microsoft bug, CVE-2026-124194, a Microsoft Outlook Spoofing Vulnerability, is under active attack. Despite its "spoofing" label and moderate CVSS of 6.5, this vulnerability can disclose NTLMv2 hashes, enabling attacker authentication.Other notable Microsoft patches include CVE-2026-116928, a Windows Search RCE vulnerability reachable via Exchange Server, rated CVSS 9.8. CVE-2026-119958 addresses a critical Windows LDAP RCE vulnerability exploitable without authentication, potentially devastating on Domain Controllers. Azure OpenAI also received an Elevation of Privilege patch, CVE-2026-119990, raising concerns due to the lack of customer guidance.Additional critical Microsoft vulnerabilities include CVE-2026-119952 in Windows Schannel, a Remote Code Execution bug with high exploitation likelihood, and CVE-2026-95962 in Windows Virtual Filtering Platform (VFP), a use-after-free RCE. An Xbox Live Networking Service RCE, CVE-2026-112967, also rated CVSS 9.8, stands out due to its unusual target.Finally, 30 of the November Microsoft CVEs are identified as "wormable," allowing unauthenticated remote code execution without user interaction. These include multiple vulnerabilities in Message Queuing, DNS, Color Management, DHCP Server, DirectMusic, and Xbox, as well as single instances in Exchange Server, LDAP, Schannel, and IIS, among others.
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Mandiant reported ShinyHunters exploiting CVE-2026-35273, a vulnerability discovered by TrendAI. TrendAI investigated three distinct vulnerabilities in PeopleSoft components, not just the single CVE Oracle initially assigned. This report details these vulnerabilities, starting with a Server-Side Request Forgery (SSRF) in the PeopleSoft Integration Gateway (PSIGW). This SSRF allows attackers to bypass PeopleSoft's validateClient method, which is meant to restrict access to sensitive functionality. The PeopleSoft Environment Management Hub (PSEMHUB) implements this validateClient method, but the SSRF allows attackers to target it via the loopback interface.The first bug leverages the PSIGW SSRF to enable attackers to craft requests to internal PeopleSoft components. By controlling the URL and payload, attackers can effectively proxy requests. This SSRF is crucial because the validateClient method permits access from localhost by default. The second vulnerability, an External Control of File Path in PSEMHUB, allows an attacker to write arbitrary content to any file on the server. By combining the SSRF with this file write vulnerability, an attacker can write a web shell to the PSEMHUB WAR path, achieving remote code execution. The third vulnerability is a Deserialization of Untrusted Data in PSEMHUB. Attackers can place a malicious XML file in a specific directory, which is then deserialized by PSEMHUB upon startup or service restart, leading to code execution. These chained vulnerabilities allow complete compromise of affected PeopleSoft instances.
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Adobe released eleven bulletins addressing 174 CVEs across various products. Critical issues were found in ColdFusion, Commerce, and Experience Manager, with ColdFusion being the most urgent due to multiple critical vulnerabilities including pre-authentication remote code execution. Commerce patches are also high priority due to its value as a target and a recent zero-day exploit. Experience Manager also had serious server-side flaws alongside numerous XSS vulnerabilities. All other Adobe patches are considered lower priority and were not publicly known or actively attacked.Microsoft set a new record with 1,415 new CVEs in October 2026, exceeding any previous year's total. This volume is attributed partly to AI accelerating bug discovery on both ends. Despite the high number, only one vulnerability was under active attack, a Windows Shell security feature bypass. Two bugs were publicly known but not actively exploited: a .NET Framework feature bypass and a MessagePack-CSharp denial-of-service bug.Notable Microsoft vulnerabilities include a SharePoint elevation of privilege exploit and a SQL Server remote code execution flaw, both exploitable by authenticated attackers. An Exchange Server remote code execution vulnerability was also released, though its exploitability is considered difficult. The release contained an alarming 59 potential wormable bugs, requiring urgent attention. Microsoft is also introducing "risk cohorts" to help customers organize their vulnerability analysis.
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The latest security patches from Adobe and Microsoft have been released, with Adobe addressing 51 unique CVEs in various products, including ColdFusion, Commerce, Lightroom Classic, Content Credentials SDK, and Adobe Campaign Classic. The patches from Adobe are considered critical, with the highest CVSS score being 10.0, and are recommended to be deployed as soon as possible, especially for Campaign Classic and ColdFusion. Microsoft's release includes 398 new CVEs, with 62 rated as Critical, and only one listed as being under active attack. The Microsoft patches impact a wide range of products, including Windows, Office, and Azure, and include several remote code execution vulnerabilities. One notable vulnerability is the Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability, which allows attackers to execute code at SYSTEM level. Another significant vulnerability is the Windows DNS Server Remote Code Execution Vulnerability, which allows a remote, unauthenticated attacker to execute code with elevated privileges. The patches also include several elevation of privilege vulnerabilities in Microsoft Exchange Server, Azure, and other products. It is essential to test and deploy these patches quickly, especially for internet-facing systems, to prevent potential attacks. The large number of patches released this month is consistent with the trend of increasing patch volumes, and it is crucial to stay on top of these updates to ensure the security of systems and data. Overall, the latest security patches from Adobe and Microsoft highlight the importance of regular updates and patch management to prevent cyber attacks and protect sensitive information.
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Pwn2Own Ireland is returning to Cork for its third year, scheduled for October 6-9, 2026. Registration closes on October 1st, 2026, at 5:00 p.m. Irish Standard Time, with no exceptions for late entries. To ensure fairness, contestants must have earned at least $15,000 in aggregate bounty payments from ZDI programs lifetime. A maximum of 80 contestants will be accepted, with up to 10 new contestants considered at the organizers' discretion. The event features seven target categories: Mobile Phones, Smart Home Devices, Wellness, Printers, Messaging, AI Infrastructure, and AI Coding Agents. Mobile phones will be targeted using the default browser or short-distance protocols like NFC, Wi-Fi, or Bluetooth. Smart home devices can be attacked via exposed network services, RF attack surfaces, or features from a laptop within the contest network. The new Wellness category focuses on healthcare devices, with attacks launched against exposed network services or RF attack surfaces. Printers, often overlooked, will also be a target, though with a reduced number of devices. The Messaging category returns, specifically targeting WhatsApp with the hope of a functioning exploit leading to code execution. Both AI Infrastructure and AI Coding Agents are new or returning categories focusing on artificial intelligence technologies and their security. The overall winner will be crowned Master of Pwn, accumulating points for successful attempts across all categories. Results will be blogged and tweeted in real-time, and contestants are strongly encouraged to read the full rules thoroughly.
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A remote code execution vulnerability exists in the HTTP Protocol Stack for Microsoft Internet Information Services implemented in HTTP.sys, which can be exploited by sending crafted HTTP packets to the target system. The vulnerability is due to invalid validation of incoming HTTP requests, and successful exploitation can result in a denial-of-service condition or code execution with kernel privileges. HTTP.sys is the kernel-mode HTTP protocol driver in Microsoft Windows, and it provides HTTP request parsing, response caching, and SSL/TLS termination for Internet Information Services and other applications. The vulnerability is caused by an integer overflow in the buffer reference array during HTTP/1.x header parsing, which can lead to a kernel pool heap buffer overflow. To trigger the overflow, an attacker must craft an HTTP request with each header line encapsulated in a separate TLS application data record, requiring a minimum of 65,536 buffer references. The total request size would be approximately 262,144 bytes, which exceeds the default MaxRequestBytes registry value of 16,384 bytes. A remote unauthenticated attacker could exploit this vulnerability by sending a specially crafted HTTP/1.x request over a TLS connection to an affected server, resulting in unexpected system termination or arbitrary code execution in the context of the kernel. Detection of this vulnerability can be achieved by monitoring and parsing traffic on TCP port 443, either by decrypting the TLS traffic and counting the number of distinct header field lines or by inspecting the pattern of TLS application data records within the encrypted session. The vulnerability was patched by Microsoft in the June 2026 release cycle, and the best method to ensure remediation is to test and deploy the vendor-supplied patch. To prevent exploitation, keeping the MaxRequestBytes registry value at or below 65,535 bytes represents a conservative configuration, and users are advised to follow the latest security patches and exploit techniques from the TrendAI Research team.
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TrendAI Research identified a double free vulnerability, CVE-2026-33824, in the Windows Internet Key Exchange (IKE) service, originally discovered by the WARP & MORSE team at Microsoft. This flaw, present in IKEv2's fragment processing, could lead to a crash of the IKEEXT service or arbitrary code execution. The vulnerability stems from improper ownership handling of a heap-allocated blob pointer during IKEv2 fragment reassembly within ikeext.dll. During the IKE_SA_INIT exchange, a Security Realm Vendor ID payload causes IkeHandleSecurityRealmVendorId() to allocate a blob, stored in the MMSA structure. When a fragmented IKE_AUTH message is reassembled, IkeReinjectReassembledPacket shallow-copies this blob pointer into a local stack struct. This struct is then shallow-copied into a heap-allocated work item by IkeQueueRecvRequest. The first free occurs when IkeDestroyPacketContext processes the work item and releases this shallow-copied blob pointer. The MMSA structure still holds the original pointer to the same allocation. The second free happens when the MMSA is cleaned up via IkeCleanupMMNegotiation, which eventually triggers IkeFreeMMSA, attempting to free the already released allocation. An unauthenticated, remote attacker can exploit this by sending a crafted IKE_SA_INIT message followed by two or more Encrypted Fragment payloads with an invalid IKE_AUTH message. Detection requires monitoring UDP ports 500 and 4500 for a specific IKE_SA_INIT sequence (including the Microsoft Security Realm Vendor ID) followed by a fragmented IKE_AUTH request containing a particular byte sequence. Microsoft patched this vulnerability in April 2026, recommending blocking inbound traffic on UDP ports 500 and 4500, or restricting traffic to known peer addresses, as temporary mitigations. Applying the vendor's update is the only full remediation.
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Day One of Pwn2Own Automotive 2026 commenced with thirty entries targeting the latest automotive systems, featuring exploits and security breakthroughs from top researchers. The competition saw significant success across various categories, particularly in exploiting in-vehicle infotainment (IVI) systems and electric vehicle chargers. Several teams, including Neodyme AG and Synacktiv, successfully gained root-level access on IVI units like the Alpine iLX-F511 and Sony XAV-9500ES through vulnerabilities such as buffer overflows and chained exploits. EV chargers proved lucrative targets, with Fuzzware.io, PetoWorks, and others manipulating charging signals or achieving code execution on devices like the Autel charger and Phoenix Contact CHARX SEC-3150, often chaining multiple bugs. Notably, the Grizzl-E Smart 40A charger was successfully exploited multiple times, including a win by SKShieldus using hardcoded credentials and an authentication bypass leading to remote code execution by Compass Security. Some attempts resulted in failure, such as the initial exploit against the Kenwood DNR1007XR and attempts by Fuzzware.io against the EMPORIA Pro Charger. However, subsequent attempts quickly exploited the Kenwood unit through command injection and out-of-bounds writes by other researchers. The competition also included successful collisions where multiple teams exploited the same or similar vulnerabilities, resulting in split rewards and Master of Pwn points. Synacktiv achieved a full win in the Tesla Infotainment category by chaining an information leak and an out-of-bounds write via a USB-based attack. Overall, the day was marked by numerous successful exploits, demonstrating critical vulnerabilities in modern automotive and charging infrastructure components.
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The Trend Micro Zero Day Initiative discovered a critical vulnerability in NVIDIA's Transformers4Rec library, allowing remote code execution with root privileges. This vulnerability, CVE-2025-23298, stems from unsafe deserialization when loading model checkpoints using Python's pickle module. Transformers4Rec, part of the Merlin ecosystem, is widely used for recommendation tasks and integrates with Hugging Face Transformers. The flaw lies in the load_model_trainer_states_from_checkpoint function, which directly uses torch.load() without safety parameters, exposing it to malicious pickle files. Pickle's __reduce__ method allows arbitrary code execution during deserialization. The attack surface is significant due to common model sharing and the trust placed in checkpoint files, especially as these processes often run with elevated privileges. A malicious checkpoint could execute system commands before model weights are loaded. The real-world impact includes remote code execution, privilege escalation, data exfiltration, and supply chain attacks. NVIDIA has patched the vulnerability by implementing a custom loading mechanism that restricts deserialization to approved classes. This incident underscores the pervasive security challenges in the ML/AI ecosystem due to reliance on pickle. Developers are urged to avoid pickle for untrusted data, use weights_only=True, restrict trusted classes, and consider secure serialization formats like Safetensors. Organizations should audit model provenance, implement signing, and sandbox model loading. The ML community needs to move away from pickle and prioritize security in framework design.
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