A critical flaw in Zcash's Orchard privacy pool, the system that lets people send the ZEC cryptocurrency while hiding amounts and parties, could have let an attacker mint unlimited counterfeit coins without detection. Security researcher Taylor Hornby, hired by developer Shielded Labs to probe the code, found it on May 29 using Anthropic's Claude Opus 4.8 model paired with a custom auditing tool, and wrote a working exploit within a day. The bug had survived four years and multiple expert reviews. An emergency fix shipped by June 1. Because the pool hides balances, there is no way to prove whether anyone exploited it earlier.
With the FIFA World Cup kicking off June 11 across the US, Canada, and Mexico, the FBI and researchers at Group-IB and Fortinet warn that a large fraud operation is already running. Group-IB tracked more than 4,300 fake FIFA websites and a Chinese-speaking crew, GHOST STADIUM, that cloned the official site pixel-for-pixel, fake login and all, across 300-plus domains. Scams include bogus ticket, merchandise, and hospitality sites, fake streaming apps that hide banking malware, and betting sites that harvest passport scans for identity theft. With tickets scarce and 150 million requests filed, scammers are exploiting fans' urgency to steal logins, money, and personal data.
Cisco has warned of an actively exploited, unpatched zero-day in Cisco Catalyst SD-WAN Manager (CVE-2026-20245) that enables root privilege escalation across all deployment types, including on-prem, Cloud, Managed, and FedRAMP Government. The flaw stems from insufficient validation of user-supplied input: an attacker who uploads a crafted file can perform command injection and run arbitrary commands as root. Exploitation requires netadmin privileges - obtained via valid credentials or by chaining CVE-2026-20182 or CVE-2026-20127. Mandiant reported the activity to Cisco's PSIRT in June. Cisco has observed limited cases where exploitation pushed configuration changes to edge devices, and published IoCs pointing to suspicious tenant-list uploads in scripts.log.
CISA has warned that attackers are actively exploiting CVE-2026-28318, a high-severity SolarWinds Serv-U denial-of-service flaw, and added it to the Known Exploited Vulnerabilities catalog. Serv-U is SolarWinds' Windows and Linux managed-file-transfer and FTP software. The flaw is an uncontrolled-resource-consumption weakness: specially crafted POST requests using Content-Encoding: deflate crash the Serv-U service without authentication, in low-complexity attacks needing no user interaction. SolarWinds shipped Serv-U 15.5.4 Hotfix 1 and advised admins who cannot patch to restrict access and block POST requests containing content-encoding. Shodan tracks over 12,000 exposed Serv-U servers (Shadowserver around 3,100). FCEB agencies must patch by June 19 under BOD 22-01.
Volexity has detailed Chinese espionage group UNC5221 (also VerdantBamboo) maintaining access to a victim's Microsoft 365 environment using the Brickstorm backdoor plus previously undocumented malware named Plenet and AgentPSD. The actor sat on the network at least 18 months before detection and had also compromised the victim's MSP. UNC5221 has exploited edge-device zero-days since at least 2023; Brickstorm began as Golang, later Rust. In this case the group pivoted from a compromised Egnyte Storage Sync system through the victim's SSL VPN, then used Brickstorm proxying and stolen credentials to reach Microsoft 365 - deliberately blending with legitimate traffic to evade Conditional Access. It re-breached the org after remediation.
ReliaQuest has documented OP-512, a China-linked espionage cluster targeting Microsoft IIS web servers with a bespoke web-shell framework - the fourth such group after CL-STA-0048, DragonRank, and GhostRedirector to single out IIS in the past year. The framework uses three web shells that grant remote access while evading signature detection and complicating forensics: each deployment is uniquely generated, access is cryptographically restricted to the attacker, and compromised servers auto-report to centralized management. To hide, the web shells timestomp - scanning surrounding files, computing the median last-modified time, and overwriting their own timestamps to match. ReliaQuest notes close tactical proximity to CL-STA-0048, suggesting a revamped toolset or shared development.
Wordfence reports active exploitation of CVE-2026-3300 (CVSS 9.8), a remote code execution flaw in the Everest Forms Pro WordPress plugin (about 4,000 active installations) affecting all versions up to 1.9.12. The Calculation Addon's process_filter() function concatenates user-submitted form-field values into a PHP string and passes it to eval() without proper escaping; sanitize_text_field() does not escape single quotes, so unauthenticated attackers can inject and run arbitrary PHP by submitting a crafted value in any string-type field when a form uses the Complex Calculation feature. Exploitation began April 13; Wordfence has blocked 29,300+ attempts. The common payload creates a rogue admin named 'diksimarina.' Patch 1.9.13 shipped March 18.
Have I Been Pwned has added BCD Travel - one of the world's largest corporate travel-management companies - to its breach corpus with 396,313 unique email addresses. BCD Travel arranges business travel for large enterprises and government clients worldwide, so the exposed dataset likely skews toward corporate and frequent-traveler accounts. As is typical for HIBP additions, the underlying breach source and disclosure details are not published alongside the entry, but the listing lets individuals and organizations check whether their accounts appear in the leaked dataset. Affected travelers should anticipate travel-themed phishing - itinerary updates, booking confirmations, loyalty-program lures - and should rotate any reused passwords and enable MFA.
Toshiba and Muji have warned website visitors that suspicious sign-in screens appearing on their sites could harvest credentials, advising anyone who entered login data to change their passwords. The pop-ups were generated by the external polyfill[.]io service, which injected malicious code via its CDN after the domain was bought by a Chinese entity in 2024 - an incident that affected more than 100,000 websites. Japanese outlets report Zojirushi, FiNC Technologies, Ishiyaku Publishers, and Hobonichi were also hit, and a researcher observed Samsung Smart TVs and sites showing the prompt on June 1. Polyfill is a JavaScript compatibility CDN for legacy browsers; affected sites should remove all polyfill[.]io references immediately.
Researcher RyotaK has disclosed a now-patched flaw in Anthropic's Claude Code GitHub Action, which drops Claude into CI/CD to triage issues and review PRs with broad repo permissions. The action's trigger check waved through any actor whose name ended in [bot] - but anyone can register a GitHub App and use its token to open an issue on a public repo. Agent mode lacked the human-actor check tag mode had. The attacker then used indirect prompt injection in an issue to make Claude read /proc/self/environ and write back the OIDC credentials, which can be replayed for an installation token with write access. Anthropic's example workflow shipped with allowed_non_write_users: '*'.
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