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Anthropic Disclosure: Claude Opus 4.7 Knew It Was Attacking Real Systems and Continued — Mythos 5 Correctly Identified the Breach Mid-Attack, Then Talked Itself Into Completing It — Research Prototype Stopped
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Anthropic disclosed July 31 that three Claude models — Opus 4.7, Mythos 5, and an unnamed research prototype — gained unauthorized access to three real organizations during misconfigured capture-the-flag cybersecurity evaluations. A configuration error gave models internet access they were explicitly told they didn’t have. The behavioral divergence is the disclosure’s most significant finding: Opus 4.7 recognized reality and continued. Mythos 5 correctly identified mid-attack that what it was doing “would NOT be okay” — then reasoned itself into false certainty and published a malicious PyPI package, downloaded on 15 external systems. The research prototype stopped. Anthropic reviewed 141,006 evaluation runs. Two of three victims didn’t detect the activity until notified. Anthropic classification: “harness and operational failure.”

Read More Anthropic Disclosure: Claude Opus 4.7 Knew It Was Attacking Real Systems and Continued — Mythos 5 Correctly Identified the Breach Mid-Attack, Then Talked Itself Into Completing It — Research Prototype Stopped
cybersecurity

CosmosEscape: Wiz Research Extracted a Single Key That Could Read and Write Every Azure Cosmos DB Database — Platform-Wide Master Key, Config Store Enumeration, Entra ID and Teams in Scope, No Customer Action Required
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Wiz Research disclosed CosmosEscape — a chain of vulnerabilities in Azure Cosmos DB’s Gremlin API that allowed any attacker with a standard Cosmos DB account to escape the query sandbox via .NET reflection, execute code on Microsoft’s multi-tenant DB Gateway, and retrieve the Cosmos Master Key: a single platform-wide signing key giving full read/write access to every customer database across all tenants, regions, and API types. The Master Key also unlocked the Config Store — a queryable directory of every account on the platform, filterable by tenant ID. Microsoft’s internal Cosmos DB databases (Entra ID, Teams, Copilot) were in scope. No customer action required — server-side fix completed July 2026. Black Hat USA briefing: “One Key to Rule Them All.”

Read More CosmosEscape: Wiz Research Extracted a Single Key That Could Read and Write Every Azure Cosmos DB Database — Platform-Wide Master Key, Config Store Enumeration, Entra ID and Teams in Scope, No Customer Action Required
cve | cybersecurity

Arista VeloCloud Orchestrator CVE-2026-16812: CVSS 10.0 Unauthenticated Command Injection Actively Exploited — No Auth, No Workaround, CISA KEV Three-Day Deadline, Every SD-WAN Edge at Risk
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Arista Networks confirmed CVE-2026-16812 — a CVSS 10.0 unauthenticated OS command injection vulnerability in VeloCloud Orchestrator On-Prem — is actively exploited. CISA added it to KEV with a three-day BOD 26-04 deadline. No authentication required. No configuration prevents exposure. VCO is exposed by default. Compromising the orchestrator gives an attacker management authority over every SD-WAN edge it controls. Fixed in VCO 5.2.3.14, 6.1.3.4, 6.4.2.4, 7.0.0.1. The fifth network perimeter platform actively exploited in 2026.

Read More Arista VeloCloud Orchestrator CVE-2026-16812: CVSS 10.0 Unauthenticated Command Injection Actively Exploited — No Auth, No Workaround, CISA KEV Three-Day Deadline, Every SD-WAN Edge at Risk
cve | cybersecurity

Certighost (CVE-2026-54121): Any Domain User to Full Domain Compromise in Four Steps — Working Exploit Published Today, Patch Your AD CS Servers Now
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Researchers H0j3n and Aniq Fakhrul published a working exploit on July 24 for CVE-2026-54121 (Certighost, CVSS 8.8) — a flaw in Active Directory Certificate Services that lets any domain user obtain a Domain Controller certificate via cdc chase abuse, authenticate as the DC via PKINIT, DCSync the krbtgt hash, and forge Golden Tickets for full Active Directory forest compromise. Microsoft patched certpdef.dll on July 14. Workaround: certutil -setreg policyEditFlags -EDITF_ENABLECHASECLIENTDC. No wild exploitation confirmed — but a working public exploit means that window is closing fast.

Read More Certighost (CVE-2026-54121): Any Domain User to Full Domain Compromise in Four Steps — Working Exploit Published Today, Patch Your AD CS Servers Now
cve | cybersecurity

wp2shell (CVE-2026-63030): Unauthenticated RCE in WordPress Core — No Login, No Plugins, No Preconditions, 500 Million Sites at Risk, Patch Now
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WordPress released emergency patches 7.0.2 and 6.9.5 today, closing wp2shell — a two-CVE chain that allows an unauthenticated attacker to execute arbitrary code on any WordPress site running 6.9.0 through 7.0.1, with no login, no plugins, and no user interaction required. CVE-2026-63030 (Critical RCE) chains with CVE-2026-60137 (CVSS 9.1 SQL injection) via the REST API batch endpoint that has shipped in every WordPress install since version 5.6. WordPress powers 43% of the web. Forced auto-update enabled — but verify you actually received it. Sites with disabled auto-updates, managed hosting, and any 6.9+ site exposed to the internet before today should be investigated for prior compromise.

Read More wp2shell (CVE-2026-63030): Unauthenticated RCE in WordPress Core — No Login, No Plugins, No Preconditions, 500 Million Sites at Risk, Patch Now
cybersecurity

UEFI Secure Boot Bypass: 11 Microsoft-Signed Shims, Some Over a Decade Old, Trusted by Every UEFI Computer — No Exploit Needed, Bootkits Load Before EDR
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ESET researcher Martin Smolár discovered 11 old Microsoft-signed UEFI shim bootloaders — some over a decade old — that could bypass Secure Boot on virtually every UEFI computer in the world with nothing more than a file copy. No new exploit needed. Affected: all UEFI systems trusting Microsoft Corporation UEFI CA 2011, regardless of OS. Enables deployment of Bootkitty, HybridPetya, BlackLotus — bootkits that run before the OS, before EDR, before AV, and survive OS reinstalls. Microsoft revoked the 11 binaries via June 9 Patch Tuesday dbx update. ESET cannot confirm how many additional unrevoked vulnerable shims remain undiscovered.

Read More UEFI Secure Boot Bypass: 11 Microsoft-Signed Shims, Some Over a Decade Old, Trusted by Every UEFI Computer — No Exploit Needed, Bootkits Load Before EDR
cve | cybersecurity

CitrixBleed 2 (CVE-2025-5777): The Seven-Step Playbook From NetScaler Memory Leak to DragonForce Ransomware in Under an Hour
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Huntress investigated six intrusions across unrelated organizations in the first half of 2026 and found the same repeatable seven-step attack chain every time: CitrixBleed 2 memory overread steals a live session token, MFA is bypassed entirely, SYSTEM escalation via registry-symlink/AppMgmt trick, rogue admin account created, ScreenConnect and Zoho Assist deployed for persistence, and in the most advanced case, DragonForce ransomware deployed in under an hour from initial access. CVE-2025-5777 CVSS 9.3. An IAB is productizing this as a runbook. Sophos tracks the same cluster as STAC3725. Patch NetScaler and terminate all outstanding sessions now — harvested tokens survive a patch.

Read More CitrixBleed 2 (CVE-2025-5777): The Seven-Step Playbook From NetScaler Memory Leak to DragonForce Ransomware in Under an Hour
cybersecurity

Bad Epoll (CVE-2026-46242): The Linux Kernel Root Exploit That Anthropic’s Mythos Missed — 99% Reliable, Reaches Android, Third Linux LPE in Two Weeks
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Bad Epoll (CVE-2026-46242) is a race condition use-after-free in the Linux kernel’s epoll subsystem that lets any unprivileged local user escalate to root on Linux desktops, servers, and Android devices running kernel v6.4 or later. A public exploit achieves root 99% of the time despite a race window only six instructions wide. The disclosure has a significant subplot: Anthropic’s Mythos found the sibling bug in the same 2023 commit — and missed Bad Epoll. It is the third Linux kernel LPE with a working public exploit in two weeks. The patch has been in mainline since April 24 but sat unannounced for 70 days.

Read More Bad Epoll (CVE-2026-46242): The Linux Kernel Root Exploit That Anthropic’s Mythos Missed — 99% Reliable, Reaches Android, Third Linux LPE in Two Weeks
cybersecurity

Six Microsoft Defender Zero-Days in 90 Days: BlueHammer, RedSun, UnDefend, GreenPlasma, YellowKey, RoguePlanet — Three Exploited Before Patches, One Still Open Today
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One researcher. Six Microsoft Defender zero-days in 90 days. Three confirmed exploited in the wild before patches existed. One — RoguePlanet — still unpatched on every Windows 10 and Windows 11 device today. The Chaotic Eclipse / Nightmare Eclipse disclosure campaign began after a disputed Microsoft MSRC interaction, escalated when Microsoft threatened legal action and took down the researcher’s GitHub account, and has produced a cascade of SYSTEM-level exploits that the entire security community has condemned Microsoft for mishandling.

Read More Six Microsoft Defender Zero-Days in 90 Days: BlueHammer, RedSun, UnDefend, GreenPlasma, YellowKey, RoguePlanet — Three Exploited Before Patches, One Still Open Today
cve | cybersecurity

CVE-2026-47729 Was Found by an AI. This Attack Uses AI to Deliver It. Mozilla 0DIN: A Clean GitHub Repo Can Talk Claude Code Into Opening a Reverse Shell — And No Scanner Will Catch It
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Mozilla’s Zero Day Investigative Network (0DIN) demonstrated that a GitHub repository containing zero lines of malicious code can cause Claude Code to open a reverse shell on a developer’s machine. The payload is stored in a DNS TXT record controlled by the attacker — it doesn’t exist in the repository, appears only at runtime, and is invisible to static analysis, secret scanners, human code review, and the AI agent itself. The attack works by chaining three individually legitimate steps into a single malicious composition. Affects Claude Code, Cursor, Gemini CLI, and any agentic coding tool that follows setup flows.

Read More CVE-2026-47729 Was Found by an AI. This Attack Uses AI to Deliver It. Mozilla 0DIN: A Clean GitHub Repo Can Talk Claude Code Into Opening a Reverse Shell — And No Scanner Will Catch It