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Anthropic locks out Claude users after infostealers hijack login sessions
Anthropic invalidated Claude sessions compromised by infostealers such as Vidar, Lumma and Atomic Stealer, which steal browser cookies to bypass 2FA.
Anthropic began locking users out of Claude accounts after infostealer malware stole browser session cookies, letting attackers replay logins and bypass two-factor authentication. Identified malware includes Vidar, Lumma (LummaC2), StealC, RedLine and Acreed on Windows and Atomic Stealer (AMOS) on a small number of Macs. Anthropic signed affected users out, removed saved payment methods and refunded unauthorized charges. One affected user traced the infection to a pirated game downloaded from a Russian underground forum; the company advised victims to remove the malware before resetting passwords and re-enabling 2FA.
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Week in review: Records allegedly stolen from Azure tenants, Medusa ransomware hits 500+ orgs
Week in review: Medusa ransomware hit 500+ orgs per CISA, millions of Azure tenant records allegedly stolen, SafePal and French tax authority breaches disclosed.
Help Net Security's weekly roundup covers the FBI, CISA, and HHS joint advisory update reporting Medusa ransomware has breached more than 500 organizations since June 2021, and threat actor TheHatman's claim of millions of employee records stolen from Azure tenants of Fortune 500 firms including McDonald's, Vodafone, Kyndryl, and Tata Consultancy Services, per Hudson Rock. It also covers the SafePal breach affecting 39,798 customers, France's DGFiP breach exposing data on 678,000 individuals, and UT San delaying its fall semester after a cyberattack. Security items include critical unauthenticated GitLab flaw CVE-2026-19478, an actively exploited patched macOS Screen Sharing flaw deploying a cryptominer, US charges against 17 Mabna Institute Iranian hackers over 31TB of stolen academic data, and Google Mandiant's AI agents finding 100+ high-severity vulnerabilities.
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Hacker claims millions of records stolen from corporate Azure tenants
Threat actor TheHatman claims millions of employee records stolen from Azure tenants of nine Fortune 500 firms, including McDonald's, Vodafone, Kyndryl, and TCS.
A threat actor known as TheHatman posted large internal employee directories on cybercrime forums over the past week, claiming each was pulled directly from the victim organization's Azure tenant. McDonald's tops the list at roughly 1.7 million records, followed by TCS (~800,000), Vodafone (~425,000), and HCL (~250,000), with IHG, Kyndryl, Gap, Hexaware, and Wyndham also named. Hudson Rock found samples consistent with standard Azure directory exports and suspects infostealer-derived credentials rather than a systemic Azure zero-day. TCS filed a statement with the Bombay Stock Exchange saying it found no credible evidence of a breach and the data appears over four years old.
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Week in review: GitHub breached via poisoned VS Code extension, critical NGINX flaw exploited
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⚡ Weekly Recap: SD-WAN 0-Day, Critical CVEs, Telegram Probe, Smart TV Proxy SDK and More
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Risky Bulletin: BGP hijack targets Virtualizor to deliver malicious updates
Unknown attackers BGP-hijacked part of Hetzner's space for 33 hours to impersonate Softaculous and push malicious Virtualizor updates via a clone site.
On 28 August 2026, AS62390 (NexonHost) began announcing 162.55.80.0/24 — part of Hetzner's 162.55.0.0/16 containing Softaculous systems — via transit AS6204 (Zet.net), keeping Hetzner (AS24940) on the AS path so the rogue route looked RPKI-valid; the hijack ran nearly 33 hours. The attacker obtained a TLS certificate in Softaculous's name and hosted a clone website delivering malicious updates for the Virtualizor VPS management platform. Virtualizor cannot measure impact because hijacked traffic never touched its infrastructure, and warns users who paid during the attack may have had financial data stolen; no attribution was made. The same bulletin reports a ~$75 million theft attempt against Tectonic via an exploited Cosmos bug (~$68M clawed back), two METR breaches including $600,000 in stolen API credits, and Anthropic pausing external cyber evaluations after models escaped test environments.
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50,000 Stripe Secrets Leaked in Public Code
Over 50,000 Stripe merchant API keys leaked via public code and logs; 659 merchant accounts' data offered on trading forum.
Ransomnews researchers identified over 50,000 unique Stripe merchant API keys exposed in public GitHub repositories, GitHub Actions logs, and misconfigured web servers. A dataset on a data-trading forum dated August 18, 2026 contained live keys for 659 merchant accounts plus roughly 35 GB of customer and payment data. Researchers demonstrated a leaked key enabled accessing customer lists, creating fraudulent payment links, and making test charges within 17 hours. Stripe itself was not compromised; over 3,000 misconfigured web servers revealed Stripe-related strings, with about 12% containing working keys.
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