Vercel, the cloud platform behind Next.js and widely used for deploying web apps, disclosed a security incident on April 18–19, 2026 after attackers gained unauthorized access to certain internal systems. The company said a compromised third‑party AI tool and an associated Google Workspace OAuth app were the vector for the intrusion; Vercel published an indicator of compromise (OAuth app client ID) and urged administrators to audit for its use. Vercel engaged incident responders (including Mandiant), notified law enforcement and said its services remain operational. The company reported a limited subset of customers was affected and that environment variables explicitly marked “sensitive” show no evidence of being read, but non‑sensitive variables containing secrets should be treated as potentially exposed and rotated. A threat actor claiming to be ShinyHunters posted purported employee records (about 580 entries) and offered data and access for sale, reportedly seeking $2 million; Vercel has not confirmed ransom negotiations. Investigation and customer notifications are ongoing.

Vercel, the U.S.-based cloud platform that hosts and deploys web applications and maintains Next.js, disclosed a security incident on April 18–20, 2026 after attackers gained unauthorized access to certain internal systems. The company says the intrusion originated from a compromised third‑party AI tool, Context.ai, whose Google Workspace OAuth app was breached. Attackers used that foothold to take over an employee Google Workspace account and pivot into select Vercel environments, enumerating environment variables not marked as “sensitive.” Vercel says sensitive variables are encrypted at rest and show no evidence of being read. The company has identified a limited subset of affected customers, engaged Google‑owned Mandiant and other responders, notified law enforcement, and published an IOC (OAuth app ID: 110671459871-30f1spbu0hptbs60cb4vsmv79i7bbvqj.apps.googleusercontent.com). A threat actor claiming the ShinyHunters persona has posted alleged employee records and is offering stolen data for about $2 million on underground forums; those claims remain partly unverified. Vercel urged customers to review activity logs, rotate non‑sensitive environment variables and deployment tokens, enable sensitive variable protections, and audit Google Workspace for the identified OAuth app.

Security vendors on April 18, 2026, warned of a new Mirai-family botnet called Nexcorium that exploits a command-injection flaw (CVE-2024-3721) in TBK DVR models — primarily DVR-4104 and DVR-4216 — to build large-scale DDoS botnets. Fortinet FortiGuard Labs and other researchers found attackers delivering a downloader script that fetches multi-architecture payloads (ARM, MIPS, x86-64), then establishes persistence via modifications to /etc/inittab, /etc/rc.local, systemd services and cron jobs. Nexcorium embeds XOR-encoded configuration data, supports multiple flood types (UDP, TCP SYN/ACK, SMTP and others), includes brute-force Telnet credentials and reuses older exploits such as CVE-2017-17215 to broaden its reach. Unit 42 and others also observed scans targeting end-of-life TP‑Link routers; CISA had previously listed related flaws in its Known Exploited Vulnerabilities catalogue. Researchers note the campaign bears markers referencing a so‑called “Nexus Team.” Organisations are advised to patch or decommission vulnerable devices, remove default credentials, apply network segmentation and monitor for abnormal outbound connections to known C2 domains.

Tyler Robert Buchanan, 24, of Dundee, Scotland, pleaded guilty in the U.S. Central District of California to conspiracy to commit wire fraud and aggravated identity theft for his role in a phishing campaign that stole at least $8 million in virtual currency. Prosecutors say Buchanan and co‑conspirators ran the scheme from September 2021 to April 2023, sending hundreds of spoofed text messages that directed employees to fraudulent websites and captured login credentials. Stolen credentials and cryptocurrency seed phrases were reportedly shared on a Telegram channel administered by Buchanan. Court documents say the group targeted telecoms, IT suppliers, cloud communications firms, virtual asset companies and individuals — impacting at least a dozen companies and, in some filings, as many as 45 victims across the United States, Canada, India and the United Kingdom. Police Scotland assisted the FBI. Buchanan has been in U.S. custody since April 2025 and faces a maximum sentence of 22 years at a sentencing hearing set for Aug. 21. Several alleged co‑conspirators remain charged in U.S. courts; one has already pleaded guilty and been sentenced.

Nicholas Moore, a 25-year-old Tennessee man who admitted repeatedly accessing the U.S. Supreme Court’s electronic filing system and the networks of AmeriCorps and the Department of Veterans Affairs, was sentenced to 12 months of probation on April 17, 2026. Moore pleaded guilty in January to a misdemeanor count of fraud and related activity in connection with computers, admitting he used stolen login credentials to view and sometimes post victims’ personal information to an Instagram account called @ihackedthegovernment. Prosecutors said he accessed the Supreme Court e-filing account on more than 25 days in 2023 and revealed details from other federal systems, including phone numbers and medical data, but reported no financial losses. The Justice Department recommended probation rather than incarceration, characterizing Moore as a “vulnerable young man” with long-term disabilities; prosecutors had sought up to 36 months of probation while the defense sought 12 months. U.S. District Judge Beryl Howell imposed the 12-month probation term and did not order prison time or fines at sentencing.

Security researchers and vendors warn that three Microsoft Defender vulnerabilities—BlueHammer, RedSun and UnDefend—have been published as proof-of-concept code and are being weaponized in real-world attacks. The exploits were released on GitHub by a researcher using the aliases Chaotic Eclipse / Nightmare‑Eclipse after a dispute with Microsoft’s Security Response Center. BlueHammer (tracked as CVE-2026-33825) was publicly released in early April and patched by Microsoft in the April Patch Tuesday updates; Huntress reported BlueHammer exploitation beginning April 10. RedSun and UnDefend were published mid‑April and, as of April 16–18 reporting, remained unpatched. RedSun’s PoC enables local privilege escalation to SYSTEM by abusing Defender’s cloud-file handling to overwrite protected binaries; UnDefend can be used by a standard user to block Defender signature updates, degrading protection. Vendors have observed attacker activity consistent with hands‑on‑keyboard post‑exploitation (e.g., whoami /priv, cmdkey /list, net group). Microsoft says it supports coordinated disclosure. Security teams are urged to apply available updates, monitor endpoint telemetry for suspicious local executable activity and known IOC patterns, and isolate affected hosts while emergency mitigations and patches are developed.