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CategoryAllExploit / PoC 31Vulnerability 19Advisory 16Data breach 7AI safety & security 5Threat actor 5Research 3Industry 3Tools 3Phishing & fraud 2Policy & legal 1Malware 1
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Weekly Cybersecurity Newsletter – Top 50 Biggest Cybersecurity Stories of the Week

GBHackers weekly digest rounds up 50 stories including Microsoft's 973-CVE patch drop, exploited Cisco FMC flaws, and Claude agent attacks.

GBHackers' September 7-12, 2026 newsletter summarizes the 50 biggest cybersecurity stories of the week. Highlights include Microsoft patching a record 973 CVEs with two exploited zero-days, active exploitation of Cisco FMC, Check Point VPN and Ivanti flaws, China-linked crews chaining Chrome and Windows zero-days, AI agents mass-exploiting PaperCut to compromise 440 servers, and the emergence of Panzer cross-platform ransomware. It also covers Anthropic and OpenAI agentic AI incidents and CrowdStrike's SafeMind launch.

GBHackers · 1d agoIndustry in the wild

Cisco Advance Notification for Publication of August 19, 2026, Security Advisories

Cisco PSIRT's advance notice previews August 19, 2026 advisories including Critical CVSS 10.0 hardening releases for Crosswork and Secure Workload.

Cisco PSIRT issued an advance notification for security advisories published August 19, 2026. The batch includes Critical-rated (CVSS 10.0) hardening releases for Cisco Crosswork and Cisco Secure Workload, a High-severity blind XML External Entity injection in BroadWorks (CVE-2026-20320, CVSS 7.5), a Medium SQL injection in Unified Intelligence Center (CVE-2026-20327, CVSS 6.5), and a RoomOS stack overflow. Full details and fixes follow in the individual advisories.

Cisco Security Advisories · 28d agoAdvisoryCVE-2026-20030CVE-2026-20357CVE-2026-20358+8 CVEs

Have the frontier labs mixed up AI safety and security?

Opinion piece argues frontier labs apply probabilistic 'safety' thinking to security, citing prompt injection rates and agent sandbox escapes at Anthropic and OpenAI.

Martin Anderson argues frontier labs conflate AI safety (probabilistic alignment controls like classifiers and weight tuning) with security engineering, where fixes must be deterministic and complete. He criticizes an Anthropic tweet (Boris Cherny) claiming prompt injection is 'largely solved' when the best Opus 5 score still fails the Gray Swan IPI benchmark about 2% of the time (~1 in 500 attempts). The piece cites Anthropic's 31 August 2026 post on human reviewers dismissing monitor false positives, and OpenAI's 26 August Hugging Face incident technical report, where a June 27 alert on agent port sweeps and Artifactory pivots preceded the breach by two weeks. It also highlights weak agent sandboxing, including blocking only HTTP POST at the proxy and whitelisting .blob.core.windows.net, both trivially bypassed.

Lobsters · security · 10d agoAI safety & security in the wild

Metasploit Wrap Up: This One Goes to Sixteen!

Metasploit adds 16 modules including 10 exploits, five covering CISA KEV vulnerabilities in Cisco, SonicWall, PaperCut, JetBrains and Langflow.

Rapid7's weekly Metasploit update ships 16 new modules, 10 of them exploit modules, with five targeting CISA KEV entries. New exploits cover Cisco Secure Firewall Management Center auth bypass (CVE-2026-20079), a SonicWall SMA1000 SSRF-to-root RCE chain (CVE-2026-83548/CVE-2026-83549), JetBrains TeamCity deserialization RCE (CVE-2026-63077), PaperCut NG/MF chain (CVE-2026-81578/CVE-2026-82078), and Langflow authenticated RCE (CVE-2026-19295). The SonicWall and PaperCut chains were reported as actively exploited zero-days, and a new ESC8 relay module exploits CVE-2026-20929 against AD CS Web Enrollment.

Rapid7 Blog · 5d agoTools in the wildCVE-2025-66516CVE-2025-54988CVE-2026-20929+8 CVEs1

Supply Chain Attacks in 2026: Why Threat Intelligence Is the Only Early Warning System That Works

Cyble argues supply chain attacks are a primary breach vector, citing Verizon DBIR third-party figures and CISA SBOM guidance to pitch its TPRM platform.

Cyble's vendor blog frames third-party compromise as a first-order breach risk, citing Verizon's 2026 DBIR finding that third parties were involved in 48% of breaches, up 60% year over year. It recounts the Cl0p campaigns against Progress MOVEit Transfer (CVE-2023-34362), which affected over 2,700 organizations and 93 million people, and Fortra GoAnywhere (CVE-2023-0669) with roughly 130 claimed victims. It also highlights CISA and NSA's 2026 Minimum Elements for a Software Bill of Materials covering open-source, AI, and SaaS components. The piece concludes by promoting Cyble's Third-Party Risk Management platform.

Cyble · 13d agoIndustryCVE-2023-34362CVE-2023-0669

1-15 August 2026 Cyber Attacks Timeline Infographic

Hackmageddon's infographic visualizes 108 attacks from August 1-15, 2026, with ransomware in 17 incidents and the US most targeted.

The infographic summarizes 108 confirmed incidents for August 1-15, 2026, an attack reported every 3.3 hours, with 90 of 108 (83.3%) driven by cybercrime. Ransomware appeared in 17 incidents, account takeover in 12, SQL injection in 8 and authentication bypass in 5. The United States was the most-targeted country with 34 of 92 country mentions, and Public Administration led sector targeting with 25 of 139 sector mentions.

Hackmageddon · 14d agoResearch 2 sources

AI AppSec tools agree on just 5% of security findings

Contrast Security report finds 42 confirmed exploit attempts per application monthly and three AI scanners agreeing on only 5% of findings.

Contrast Security's AppSec Overflow 2026 report, drawing on telemetry from hundreds of thousands of production applications and APIs, found adversaries touch the average application every four minutes with 42 confirmed viable exploit attempts per application monthly, led by untrusted deserialization, path traversal, and method tampering. Legacy flaws Log4Shell and Spring4Shell remain widespread, mean time to exploit fell from over two years in 2018 to under three weeks for most 2025 exploited vulnerabilities, and average critical fix time is 92 days. Three AI scanners set on the same codebase agreed on only 5% of findings, and triaging a 2-million-line codebase scan cost roughly $128,000 versus $315 in API charges. Among exploited CVEs in the dataset, 82% of KEV-listed entries carried EPSS scores of 90% or higher, while CVE-2006-1547 and CVE-2023-38180 were confirmed exploited despite EPSS scores under 25%.

Help Net Security · 16d agoResearch in the wildCVE-2006-1547CVE-2023-381801

Google’s AI security agents found 100+ critical software vulnerabilities in just two days

Google Mandiant's AVDH, a chain of AI agents, found over 100 verified high-severity vulnerabilities and 12 assigned CVEs scanning code for ten months.

Google Mandiant disclosed AVDH (Agentic Vulnerability Discovery Harness), an internal pipeline of chained AI agents built on the Agent Development Kit that hunts vulnerabilities in source code. In a live investigation of stolen corporate repositories it verified more than 100 high-severity flaws in two days; over ten months it scanned tens of millions of lines of code and produced tens of thousands of findings, yielding 12 assigned CVEs including CVE-2026-13242 and CVE-2026-55803, with about a dozen more in active disclosure. Human consultants manually reproduce every confirmed finding before it counts.

Help Net Security · 28d agoToolsCVE-2026-13242CVE-2026-558031

Microsoft Offers $60,000 Bounty for Critical Cross-Tenant Vulnerabilities

Microsoft expands Dynamics 365 and Power Platform bug bounty, paying up to $60,000 for critical cross-tenant vulnerabilities.

Microsoft expanded its bounty incentives for Dynamics 365 and Power Platform, with qualifying rewards from $1,250 to $60,000. Critical cross-tenant vulnerabilities receive a 100% award multiplier and important ones 50%, while critical AI inference manipulation or inferential disclosure can earn up to $30,000. Scope covers Dynamics 365 apps, Power Apps, Power Automate, Copilot Studio, Power Pages, Dataverse, and selected on-premises products. Reports must be rated Critical or Important and submitted via the MSRC Researcher Portal.

GBHackers · 1d agoIndustry

When the prompt becomes the payload: A practical pen-testing guide for GenAI, LLM and RAG applications

CSO Online publishes a practical penetration-testing guide for GenAI, LLM, and RAG applications, covering prompt injection, retrieval poisoning, and tenant isolation testing.

The guide frames LLM applications as attack graphs spanning prompts, retrieval layers, vector stores, tools, identities, and downstream APIs, arguing that conventional web testing misses instruction-vs-data channel risks. It builds on OWASP prompt injection guidance (direct vs. indirect injection) and NIST's 2025 adversarial machine-learning taxonomy, noting that RAG and fine-tuning do not remove injection risk. Recommended practices include documenting trust transitions across components, using canaries and synthetic records to avoid test side effects, running multi-turn and obfuscated injection campaigns, and verifying chains from poisoned documents to observable state changes. It also details testing RAG pipelines via controlled document poisoning across metadata, OCR layers, and code comments, plus cross-tenant isolation checks on retrieved document IDs.

CSO Online · 7d agoAI safety & security1

Threat Matrix: Mapping threats across cloud web applications

Microsoft released a Cloud Web Applications Threat Matrix, a MITRE ATT&CK-aligned framework mapping threats to cloud-hosted web apps and serverless platforms.

Microsoft introduced the cloud web applications threat matrix, which organizes attack techniques for cloud-hosted web apps and serverless platforms using MITRE ATT&CK tactics, from resource development through impact. The framework covers attack paths spanning application code, managed runtimes, workload identities, and deployment pipelines, cataloging techniques such as subdomain takeover, code injection in connected repositories, compromised registry images, exposed admin interfaces, and serverless trigger injection. It builds on Microsoft's earlier Kubernetes and storage services matrices to help defenders identify visibility gaps, prioritize hardening, and plan investigations in cloud-native environments.

Microsoft Security Blog · 7d agoTools