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7 editions · 6 items

October 28, 2026

  • VerCellBreak defeats Vercel Sandbox egress whitelisting without the sandbox ever talking to the attacker: a hijacked agent presents a forged mTLS client certificate whose AIA extension URL encodes the data, and the trusted whitelisted server fetches that URL itself while building the chain. Four conditions must hold — whitelisted egress, a controlled agent, a whitelisted domain requiring mTLS, and a server that resolves AIA. AIR Security disclosed it on 12 October and has no evidence of in-the-wild use (NSFOCUS). · AI & Agent Security

in Pre-Boot RCE in EDK2 Breaks Cover Months Before Its Disclosure Date

October 15, 2026

  • Vercel’s sandbox challenge uncovered an upstream Linux kernel zero-day. Across 1,285 reports submitted over two weeks, Vercel paid $242,000 and confirmed a bug that leaked host memory from production sandboxes. Host crashes and code execution were demonstrated only on matching laboratory KVM and Firecracker systems; fixes remain under private review and CVEs are pending. This expands yesterday’s challenge finding (earlier coverage). Vercel · Vulnerability Research

in A Crafted Attachment Can Root Cisco’s Secure Email Gateway

October 5, 2026

Citrix Names the NetScaler SAML Zero-Day and Ships an Emergency Patch

Citrix released an emergency patch for CVE-2026-88779, a SAML authentication bypass in NetScaler that requires no authentication and is being actively exploited in the wild; researchers are investigating whether the vulnerability extends beyond denial-of-service to remote code execution. South Korea's financial regulator disclosed that a single threat actor compromised seven banks and financial institutions using automated AI-driven tooling, with traces of ARTEX AI, an open-source penetration-testing system, found on attacker infrastructure. Claude Code was found vulnerable to prompt injection via .git worktree confusion (CVE-2026-55607), allowing sandbox escape through malicious repository content. A researcher achieved guest-to-host VM escape in KVM, validated by Vercel's sandbox bounty program, and Android 17 added restrictions on accessibility services to block banking malware overlay attacks.