Mandiant

CISA Adds BeyondTrust Remote Support and Fortinet Flaws to KEV Catalog Following Zero-Day Exploitation by ARMORY CASTLE

The US Cybersecurity and Infrastructure Security Agency has added two vulnerabilities affecting Fortinet and BeyondTrust products to its Known Exploited Vulnerabilities catalog. CVE-2026-102764 is an authentication bypass flaw in BeyondTrust Remote Support that allows remote attackers to manipulate appliance files without credentials due to insufficient source validation. BeyondTrust released an advisory on October 15, 2026, rating the issue 9.3 on CVSS v4.0 as Critical. Mandiant attributes the zero-day exploitation to the suspected Chinese group ARMORY CASTLE, which deployed web shells for persistence and privilege escalation in late August. The second CVE, CVE-2025-61624, also appears on the KEV list but lacks further public technical details in the current advisory. Organizations are urged to apply patches immediately to prevent further compromise.

WannaCry Ransomware: How EternalBlue Turned One Infection Into a Global Epidemic

On 12 May 2017, the WannaCry ransomware worm rapidly infected more than 230,000 computers across at least 150 countries by exploiting the unpatched SMBv1 vulnerability with the EternalBlue exploit. The malware combined remote code execution via EternalBlue with file encryption and ransom demands in Bitcoin, affecting hospitals, manufacturers, and government organizations worldwide. Microsoft had released the MS17-010 patch two months earlier, yet many systems remained vulnerable due to delayed deployment in large environments. WannaCry scanned both local subnets and random public IPv4 addresses in parallel threads, allowing infected machines to autonomously discover and compromise new targets without user interaction. Security researcher Marcus Hutchins halted the initial wave by registering a hardcoded kill-switch domain, though later variants removed this check. The incident demonstrated how a known, patchable flaw combined with worm-like propagation could produce worldwide operational disruption.

Bitget Loses $351 Million in Record 2026 Crypto Theft After Attackers Forge Internal Transfers

Bitget's hot and warm wallets were drained of approximately $351 million on September 24, marking the largest known single crypto theft of 2026. Attackers did not steal private keys but instead forged internal transfer requests that bypassed approval workflows. The stolen assets spanned at least five blockchains, with the largest portion being roughly 103 million XRP worth about $157 million. Bitget's CEO Gracy Chen attributed the incident to North Korean hackers based on IP patterns, behavioral signatures, and on-chain evidence matching prior operations. The exchange maintains a $464 million user protection fund sufficient to cover all losses, while deposits and trading remain unaffected and only withdrawals are temporarily frozen. The case highlights how process-level compromises can bypass even robust key-management controls in cryptocurrency exchanges.

Mandiant Uncovers WAF Bypass Campaign Exploiting Critical Oracle PeopleSoft CVE-2026-35273

Mandiant has identified an active campaign abusing CVE-2026-35273, a critical unauthenticated remote code execution flaw in Oracle PeopleSoft's Environment Management Hub (PSEMHUB). Attackers bypass web application firewalls by replacing the literal path /PSEMHUB/ with /%50SEMHUB/, exploiting the fact that many WAF rules inspect the URL before decoding while the PeopleSoft application server decodes it afterward. The exploitation chain relies on Java object deserialization via POST requests to /%50SEMHUB/hub, allowing deployment of two distinct JSP web shells. The group then establishes persistence with a trojanized installer that drops the SIDEEYE backdoor along with Neo-reGeorg and MeshAgent. Activity attributed to UNC6240, linked to ShinyHunters, began as a zero-day against educational institutions in June 2026 and has since expanded to higher education, technology, healthcare, agriculture, transportation, and government sectors.