# Kiteworks cybersecurity threat and system shutdowns > Live situation record from CLSTR: https://clstr.news/situations/kiteworks-cybersecurity-threat-and-system-shutdowns > Updated: 2026-09-29T14:13:00.000Z. Sources: 10. Developments: 2. Software company Kiteworks issued advisories for customers to perform precautionary system shutdowns following warnings from federal intelligence authorities regarding an imminent cyberattack. Initially, the company recommended a six-hour shutdown window to mitigate risks associated with potential ‘zero-day’ vulnerabilities. As the situation developed, the advisory was updated to a nine-hour shutdown for certain systems, specifically targeting a critical vulnerability within the ‘Advanced Forms’ feature in version 9.5.1. While Kiteworks reported no confirmed compromises or active exploitations, the company managed shutdowns for its hosted services, while instructing self-hosted users to facilitate their own. The general shutdown advisory was lifted on September 27, though customers using Advanced Forms in self-hosted environments were instructed to contact support before resuming operations. ## Timeline ### 2026-09-29: Spectre-v2 BTR vulnerability affects Intel, AMD, and Arm CPUs Researchers have identified a new Spectre-v2 CPU vulnerability called Branch Target Reuse (BTR) that affects Intel, AMD, and Arm processors by exploiting JIT engines to leak sensitive data. 6 sources. https://clstr.news/cluster/kiteworks-advises-precautionary-shutdown-following-federal-threat-intelligence ### 2026-09-25: Kiteworks urges precautionary system shutdowns amid cyberattack threat Kiteworks has urged customers to perform a precautionary system shutdown following credible intelligence from federal authorities regarding an imminent threat of a cyberattack. 6 sources. https://clstr.news/cluster/kiteworks-urges-precautionary-system-shutdowns-amid-cyberattack-threat --- Cite as: Kiteworks cybersecurity threat and system shutdowns. CLSTR, https://clstr.news/situations/kiteworks-cybersecurity-threat-and-system-shutdowns