The threat actors used internet-exposed SolarWinds Web Help Desk (WHD) instances to gain initial access and then proceed laterally across the organization's network to other high-value assets, according to Microsoft's disclosure of a multi-stage attack.
However, it is unclear if the activity used a previously patched vulnerability (CVE-2025-26399, CVSS score: 9.8) or recently revealed vulnerabilities (CVE-2025-40551, CVSS score: 9.8, and CVE-2025-40536, CVSS score: 8.1), according to the Microsoft Defender Security Research Team.
"Since the attacks occurred in December 2025 and on machines vulnerable to both the old and new set of CVEs at the same time, we cannot reliably confirm the exact CVE used to gain an initial foothold," the company said in the report.
CVE-2025-40551 and CVE-2025-26399 both relate to untrusted data deserialization vulnerabilities that could result in remote code execution, and CVE-2025-400536 is a security control bypass vulnerability that might enable an unauthenticated attacker to access some restricted functionality.
Citing proof of active exploitation in the field, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2025-40551 to its list of known exploited vulnerabilities (KEVs) last week. By February 6, 2026, agencies of the Federal Civilian Executive Branch (FCEB) were required to implement the solutions for the defect.
The successful exploitation of the exposed SolarWinds WHD instance in the attacks that Microsoft discovered gave the attackers the ability to execute arbitrary commands within the WHD application environment and accomplish unauthenticated remote code execution.
Microsoft claimed that in at least one instance, the threat actors used a DCSync attack, in which they impersonated a Domain Controller (DC) and asked an Active Directory (AD) database for password hashes and other private data.
Users are recommended to update WHD instances, identify and eliminate any unauthorized RMM tools, rotate admin and service accounts, and isolate vulnerable workstations to minimize the breach in order to combat the attack.
"This activity reflects a common but high-impact pattern: a single exposed application can provide a path to full domain compromise when vulnerabilities are unpatched or insufficiently monitored," the creator of Windows stated.
Two students affiliated with Stanford University have raised $2 million to expand an accelerator program designed for entrepreneurs who are still in college or who have recently graduated. The initiative, called Breakthrough Ventures, focuses on helping early-stage founders move from rough ideas to viable businesses by providing capital, guidance, and access to professional networks.
The program was created by Roman Scott, a recent graduate, and Itbaan Nafi, a current master’s student. Their work began with small-scale demo days held at Stanford in 2024, where student teams presented early concepts and received feedback. Interest from participants and observers revealed a clear gap. Many students had promising ideas but lacked practical support, legal guidance, and introductions to investors. The founders then formalized the effort into a structured accelerator and raised funding to scale it.
Breakthrough Ventures aims to address two common obstacles faced by student founders. First, early funding is difficult to access before a product or revenue exists. Second, students often do not have reliable access to mentors and industry networks. The program responds to both challenges through a combination of financial support and hands-on assistance.
Selected teams receive grant funding of up to $10,000 without giving up ownership in their companies. Participants also gain access to legal support and structured mentorship from experienced professionals. The program includes technical resources such as compute credits from technology partners, which can lower early development costs for startups building software or data-driven products. At the end of the program, founders who demonstrate progress may be considered for additional investment of up to $50,000.
The accelerator operates through a hybrid format. Founders participate in a mix of online sessions and in-person meetups, and the program concludes with a demo day at Stanford, where teams present their progress to potential investors and collaborators. This structure is intended to keep participation accessible while still offering in-person exposure to the startup ecosystem.
Over the next three years, the organizers plan to deploy the $2 million fund to support at least 100 student-led companies across areas such as artificial intelligence, healthcare, consumer products, sustainability, and deep technology. By targeting founders at an early stage, the program aims to reduce the friction between having an idea and building a credible company, while promoting responsible, well-supported innovation within the student community.