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Lead Story
CISA: Microsoft SharePoint flaw now exploited in ransomware attacks
CISA now flags SharePoint RCE flaw CVE-2026-45659 as used by ransomware. Microsoft fixed the low-privilege deserialization bug in May; Shadowserver sees more than 8,500 exposed SharePoint servers, over 200 still unpatched.
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Why it matters: Any compromised account with SharePoint access can become the entry point.
Recommended action: Verify the May updates on every farm server and enable AMSI integration.
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Original source: BleepingComputer
Also Worth Your Attention
CISA Adds One Known Exploited Vulnerability to Catalog
CISA’s August 7 KEV addition is Progress LoadMaster command injection CVE-2026-8037, listed on evidence of active exploitation.
Why it matters: Edge appliances like LoadMaster are often patched late because they are hard to take offline.
Recommended action: Schedule the LoadMaster update now and check appliances for unknown accounts or files.
Read more on CyberExperts: Read more on CyberExperts
OpenAI Launches GPT-5.6-Cyber with Reduced Safeguards for Exploit Development
OpenAI released GPT-5.6-Cyber for vetted security teams through a new Daybreak Red access tier, with fewer refusals on exploit development. It completed 95.0% of OpenAI’s advanced cyber tasks, against 1.5% for GPT-5.6 Sol.
Why it matters: More AI-assisted bug hunting at vendors means more advisories and patches for customers to absorb.
Recommended action: Check that patch processes can handle a larger volume of vendor advisories.
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ChainDrop: Inside a Self-Propagating npm Worm
The ChainDrop npm worm spread through the keyv, cacheable and ecto ecosystems into hundreds of package versions, stealing secrets and writing VS Code and Claude Code hooks into repositories.
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Why it matters: Developer tools now run code when a folder opens, which gives worms a new persistence point.
Recommended action: Search repositories for new .claude/ and .vscode/ hook files.
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#StopRansomware: Gunra Ransomware
A joint advisory from the FBI, CISA, NSA, DC3, the Secret Service and Korea’s KNPA warns about Gunra, a Conti-derived ransomware-as-a-service that gets in through Fortinet flaws CVE-2024-55591 and CVE-2025-24472.
Why it matters: Gunra gives victims five to seven days to pay before leaking data, and it has deleted backups.
Recommended action: Patch internet-facing Fortinet devices and keep immutable, offline-tested backups.
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Newer CyberExperts coverage on this topic
This article still works as background. If you want the current picture, start with the freshest related coverage below and today's brief.
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Monday’s brief: GlobalProtect logins without passwords, then SonicWall, AhsayCBS and NetScaler
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