Vulnerabilities
Microsoft released mitigations for YellowKey (CVE-2026-45585), a BitLocker bypass disclosed by the researcher behind MiniPlasma. A USB port and a reboot defeat the encryption on any TPM-only device — and the only fix is a TPM+PIN configuration change, not a patch.
Nation-State Cyber Threats
ESET documented Webworm, a China-aligned APT that pivoted from Asia to European governments. Its two new backdoors — EchoCreep and GraphWorm — run command-and-control entirely on Discord and Microsoft OneDrive, hiding inside the trusted cloud traffic every enterprise allowlists.
Application Security
Microsoft's Digital Crimes Unit disrupted Fox Tempest on May 19 — a malware-signing-as-a-service operation that issued over 1,000 fraudulent code-signing certificates to ransomware crews including Rhysida, Vanilla Tempest, and three Storm clusters at up to $9,500 per signed sample.
Cyber Crime
Europol and Eurojust executed Operation Endgame 2.0 May 19-22: 300+ servers dismantled, 650 domains, 20 international arrest warrants, €3.5M crypto seized across seven countries. The strategic target is the initial-access-broker layer that supplies ransomware affiliates.
Policy & Government
GitGuardian discovered a public GitHub repo named 'Private-CISA' holding 844 MB of plaintext passwords, AWS GovCloud admin tokens, and Entra ID SAML certs belonging to CISA — public since November 2025. The Nightwing contractor engineer manually disabled push-protection.
Threat Intelligence
Verizon's 19th DBIR re-baselines the threat model: vulnerability exploitation hit 31% of breaches up from 20% — now the #1 vector. Credential abuse fell to 13%. AI is shrinking patching windows from months to hours. Third-party breaches up 60% YoY.
Critical Infrastructure
The Record disclosed that the July 23, 2024 nationwide outage of Luxembourg's POST mobile network — which knocked out 4G, 5G, landline, and emergency comms for 3+ hours — was caused by a Huawei enterprise router zero-day. Ten months later: no CVE, no Huawei acknowledgment.
Application Security
InfoGuard Labs disclosed seven CVEs in SEPPmail Secure E-Mail Gateway including CVE-2026-2743 (CVSS 10.0 path traversal to full appliance takeover) and CVE-2026-44128 (unauthenticated Perl eval() RCE). Patched in 15.0.2.1, 15.0.3, and 15.0.4.
Application Security
Mini Shai-Hulud pushed ~42 malicious packages through a compromised @antv maintainer account on May 19 with valid Sigstore Fulcio certificates and Rekor entries. The green "verified" badge defenders have been trusting now sits on malicious code.
Google Threat Intelligence Group disclosed the first known AI-developed zero-day used in the wild — a Python 2FA bypass intended for mass exploitation. Google identified the LLM fingerprint and coordinated a patch before the campaign could launch.
A single npm user account pushed four malicious packages, including a near-verbatim clone of the Shai-Hulud worm, within a week of TeamPCP open-sourcing the worm source on BreachForums. Mini Shai-Hulud has graduated from a campaign to an ecosystem capability.
Symantec independently confirmed Fast16, a 2005-era pre-Stuxnet sabotage framework first disclosed by SentinelOne. It silently corrupted LS-DYNA and AUTODYN finite-element solver outputs for nuclear weapons design, acting only when material density crossed 30 g/cm cubed.
INTERPOL announced Operation Ramz, the first regional cybercrime enforcement operation focused on MENA. Active October 2025 – February 28, 2026: 201 arrests, 53 servers seized, 3,867 victims across 13 participating countries. Kaspersky and Group-IB contributed.
Nightmare-Eclipse released MiniPlasma May 13, 2026 — a working SYSTEM-level exploit for cldflt.sys on fully patched Windows 11. The bug is CVE-2020-17103, patched by Microsoft in December 2020. The 2020 PoC still works — and no 2026 patch exists.
NYC Health + Hospitals confirmed an intrusion through an unnamed third-party vendor exposed personal and medical data of at least 1.8 million individuals, including stolen biometric fingerprint records. The first major US public-hospital disclosure to confirm biometric loss.
CrowdStrike extended Falcon AIDR to Kubernetes AI workloads with a 180-technique taxonomy and 99% sub-30ms benchmark — making AI runtime security a five-vendor category.
Tycoon2FA is back six weeks after the Microsoft/Europol takedown — now phishing OAuth device-code consents against M365 via a Trustifi-laundered relay.
Grafana caught a CoinbaseCartel breach via canary token, traced it to a pull_request_target Pwn Request, and refused to pay — the second Pwn Request hit in three weeks.
CrowdStrike's 2026 Financial Services Threat Landscape Report logs $2.02B in DPRK theft, PRESSURE CHOLLIMA's $1.46B record heist, and AI-tripled CHOLLIMA tempo.
XBOW disclosed a CVSS 9.8 unauthenticated RCE in Exim — and used the seven-day window to race its autonomous LLM exploit pipeline against human researchers.
Apache HTTP Server 2.4.66 ships with a double-free in mod_http2 — exploitable on default Debian builds and patched six days later in 2.4.67.
