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Cybersecurity Brief – 2026-05-27

Wed, 27 May 2026 00:00:00 +0000

Major Incidents or Breaches

Charter Communications confirmed a data breach after the ShinyHunters extortion group threatened to leak stolen data unless a ransom was paid ^[13].
Information allegedly stolen from 7-Eleven has been leaked, impacting approximately 185,000 individuals and exposing email addresses, names, addresses, and dates of birth ^[33].
Over 5,500 GitHub repositories were compromised in a campaign using Megalodon malware, resulting in theft of credentials and developer secrets ^[18].
More than 700 education and tech websites were hijacked in a large-scale ClickFix malware campaign, exploiting a Ghost CMS flaw to serve malicious Cloudflare verification pages ^[40].

Newly Discovered Vulnerabilities

Microsoft released patches for a critical remote code execution vulnerability in SharePoint (CVE-2026-45659), which could be exploited without specialized conditions ^[8]^[20].
A critical zero-day vulnerability in the KnowledgeDeliver learning management system was exploited to deploy the Godzilla web shell; the flaw involved hardcoded machineKey values that enabled ViewState deserialization attacks ^[12]^[35].
CISA ordered immediate patching of an actively exploited SQL injection vulnerability in Drupal CMS for US government agencies ^[17].
CISA urged urgent patching of a zero-day vulnerability in the LiteSpeed cPanel plugin that was exploited in the wild to execute scripts with root privileges ^[29].

Notable Threat Actor Activity

The ShinyHunters extortion group was responsible for threats and data leaks targeting Charter Communications and 7-Eleven ^[13]^[33].
The Iranian APT group MuddyWater conducted a new espionage campaign targeting organizations across nine countries, employing DLL side-loading techniques ^[6].
The Iranian APT known as Nimbus Manticore continued targeting aviation and software companies using updated tools ^[32].
The FBI warned that the Silent Ransom Group is sending operatives in person to law firms to physically insert USB drives and steal data ^[28].
Fake installers and plugins for popular software such as ChatGPT and Claude, distributed via GitHub and SourceForge, were found to deliver Deno RAT, granting attackers full device control ^[39].

Trends, Tools, or Tactics of Interest

Threat actors are increasingly augmenting attacks with AI tools, including real-time operational deployment of AI in offensive operations, smarter AI-driven DDoS attacks, and use of AI to generate plain-English remediation guidance for vulnerabilities ^[2]^[7]^[38]^[37].
AI chatbot recommendations are being abused to redirect users to cryptojacking malware sites in active campaigns ^[5].
Multi-factor authentication (MFA) prompt bombing remains a prevalent tactic to bypass second-factor protections ^[9].
Remote access trojans such as BTMOB are leveraging ready-made campaign tools to lower barriers for full device compromise on Android devices ^[4].
Microsoft Defender is testing automatic endpoint isolation to prevent lateral movement after compromise ^[15].
AppOmni’s Marlin AI and Varonis Atlas are leveraging AI for autonomous SaaS security investigation and AI governance, respectively ^[31]^[14].
Anthropic released a Claude Sandbox security plugin to assist developers in identifying vulnerabilities during coding and expanded Claude’s enterprise security governance with 28 new integrations, including major security vendors ^[30]^[34].

Regulatory or Policy Developments Affecting the Security Industry

The Indian Computer Emergency Response Team (CERT-In) issued guidelines mandating that critical vulnerabilities in internet-facing systems be patched within 12 hours of detection amid increased AI-assisted attacks ^[10].
CISA announced a revised schedule for town halls to engage stakeholders on cyber incident reporting requirements for critical infrastructure ^[27].

Sources

Charter confirms data breach after ShinyHunters extortion threat - bleepingcomputer.com
185,000 Likely Impacted by 7-Eleven Data Breach - securityweek.com
Feeding Frenzy: 'Megalodon' Malware Infects Thousands of GitHub Repos - darkreading.com
700+ education and tech websites hijacked in huge ClickFix malware campaign - malwarebytes.com
Microsoft Patches SharePoint RCE Flaw CVE-2026-45659 Across Server Versions - thehackernews.com
Microsoft Issues Out-of-Band SharePoint Patch - darkreading.com
KnowledgeDeliver flaw exploited as a zero-day to install web shells - bleepingcomputer.com
Hackers Exploited KnowledgeDeliver Zero-Day for Web Shell Deployment - securityweek.com
CISA orders feds to patch actively exploited Drupal vulnerability - bleepingcomputer.com
CISA Urges Immediate Patching of Exploited LiteSpeed cPanel Plugin Zero-Day - securityweek.com
MuddyWater Uses DLL Side-Loading in Espionage Campaign Targeting 9 Countries - thehackernews.com
Iranian APT Targets Aviation, Software Companies With Updated Tools - securityweek.com
FBI: Hackers Sending Operatives in Person to Insert USB Drives and Steal Data - securityweek.com
Fake software on GitHub and SourceForge distribute Deno RAT - malwarebytes.com
Report: Adversarial Use of AI is Evolving - blog.knowbe4.com
[THN Webinar] New AI DDoS Attacks Are Smarter. Learn How to Fight Back - thehackernews.com
AI Threat Landscape Digest March-April 2026 - research.checkpoint.com
Open Source DockSec Uses AI to Cut Through Vulnerability Noise in Docker Images - securityweek.com
AI Chatbot Recommendations Redirect Users to Cryptojacking Malware Sites - thehackernews.com
MFA Prompt Bombing: Why Your Second Factor Isn't Saving You - thehackernews.com
BTMOB: A stealthy RAT burrowing deep into Android devices - welivesecurity.com
Microsoft Defender can now automatically isolate hacked endpoints - bleepingcomputer.com
AppOmni’s Marlin AI Brings Autonomous Investigation to SaaS Security - securityweek.com
How Varonis Atlas integrates Claude Compliance API for AI governance - bleepingcomputer.com
Anthropic Releases New Claude Sandbox, Security Guidance Plugin - securityweek.com
Anthropic Expands Claude’s Enterprise Security Governance With 28 New Integrations - securityweek.com
CERT-In Recommends 12-Hour Patching for Internet-Facing Flaws Amid AI-Assisted Attacks - thehackernews.com
CISA Announces Revised Town Hall Schedule to Engage with Stakeholders on Cyber Incident Reporting for Critical Infrastructure - cisa.gov

Cybersecurity Brief – 2026-05-26

Tue, 26 May 2026 00:00:00 +0000

Major Incidents or Breaches

7-Eleven suffered a data breach in April resulting in the compromise of personal information belonging to over 183,000 individuals. The ShinyHunters extortion group was responsible for the attack, which targeted the systems of the convenience store chain^[7]^[25].
The Oncology Institute disclosed a data breach caused by a third-party vendor, with the specific vendor not named^[20].
Radiology Associates of Richmond experienced a data breach affecting 266,000 individuals, with threat actors stealing files containing names and protected health information^[21].
DocketWise reported a data breach impacting 143,000 people, involving the compromise of names, addresses, Social Security numbers, financial information, and medical data from third-party partner repositories^[24].

Newly Discovered Vulnerabilities

A now-patched high-severity flaw in the Digital Knowledge KnowledgeDeliver LMS was exploited as a zero-day, enabling attackers to deploy Godzilla web shells and Cobalt Strike beacons^[1].
A critical vulnerability in Ghost CMS, tracked as CVE-2026-26980, is being actively exploited to inject malicious JavaScript code for ClickFix attacks. Over 700 websites, including those of major universities and DuckDuckGo, have been compromised^[3]^[19].
Microsoft confirmed a known issue with Windows Server 2016 after the KB5087537 May 2026 security update, causing domain controller lookups to fail^[6].

Notable Threat Actor Activity

The North Korea-linked Lazarus Group has deployed the RemotePE cross-platform memory-only remote access trojan (RAT) in attacks targeting financial and cryptocurrency organisations^[5].
The ShinyHunters extortion gang was identified as the actor behind the 7-Eleven breach^[7]^[25].
TeamPCP continues its supply chain campaign, operating across three package ecosystems, trojanising an officially Microsoft-published Python SDK, and reaching GitHub’s internal codebase^[17]^[18].
The FBI issued a warning regarding the Kali365 phishing-as-a-service platform, which targets Microsoft 365 accounts by abusing OAuth device code authentication to steal session tokens and bypass multifactor authentication^[9].

Trends, Tools, or Tactics of Interest

Attackers are increasingly exploiting supply chain weaknesses, as demonstrated by the TeamPCP campaign and the poisoning of Laravel-Lang packages to deliver malware and exfiltrate CI secrets^[17]^[18]^[23].
The AI-driven bug hunting arms race is intensifying, with attackers leveraging AI for exploit development and defenders using AI models such as Anthropic’s Mythos, which detected 23,000 potential vulnerabilities across 1,000 open-source projects, many of which are critical or high severity^[12]^[22].
There is a rise in phishing-as-a-service platforms, with Kali365 providing tools to bypass multifactor authentication protections on Microsoft 365 accounts^[9].
Recent incidents highlight the use of memory-only malware and advanced remote access trojans, as seen in Lazarus Group’s deployment of RemotePE^[5].

Regulatory or Policy Developments Affecting the Security Industry

Dutch authorities seized 800 servers and arrested two individuals connected to hosting infrastructure used by Russian state actors for cyberattacks and influence operations^[13].

Sources

7-Eleven data breach exposes personal information of 185,000 people - bleepingcomputer.com
25th May – Threat Intelligence Report - research.checkpoint.com
Oncology Institute Discloses Data Breach - securityweek.com
266,000 Affected by Data Breach at Radiology Associates of Richmond - securityweek.com
DocketWise Data Breach Impacts 143,000 - securityweek.com
KnowledgeDeliver LMS Flaw Exploited to Deploy Godzilla and Cobalt Strike - thehackernews.com
Ghost CMS CVE-2026-26980 Exploited to Hijack 700+ Sites for ClickFix Attacks - thehackernews.com
Ghost CMS Vulnerability Exploited to Hack Over 700 Websites - securityweek.com
Microsoft: Domain Controller lookup may fail on Windows Server 2016 - bleepingcomputer.com
Lazarus Deploys RemotePE Memory-Only RAT Against Financial and Crypto Firms - thehackernews.com
TeamPCP Supply Chain Campaign: Activity Through 2026-05-24, (Mon, May 25th) - isc.sans.edu
TeamPCP Supply Chain Campaign: Activity Through 2026-05-24, (Mon, May 25th) - isc.sans.edu
FBI warns of Kali365 phishing service targeting Microsoft 365 accounts - bleepingcomputer.com
Laravel-Lang Packages Poisoned for Malware Delivery - securityweek.com
The AI Era Is Creating a Bug Hunting Arms Race - wired.com
Anthropic: Mythos Detected 23,000 Potential Vulnerabilities Across 1,000 OSS Projects - securityweek.com
Netherlands Seizes 800 Servers, Arrests 2 for Aiding Cyberattacks - krebsonsecurity.com

Cybersecurity Brief – 2026-05-25

Mon, 25 May 2026 00:00:00 +0000

Major Incidents or Breaches

Over 5,500 GitHub repositories were compromised in the ‘Megalodon’ supply chain attack, where malicious actors used fake automated commits to inject GitHub Actions workflows containing payloads designed to steal credentials, CI secrets, keys, and tokens ^[6].
A large-scale exploitation campaign is targeting a critical SQL injection vulnerability (CVE-2026-26980) in Ghost CMS, enabling attackers to inject malicious JavaScript code and initiate ClickFix attack flows ^[2].

Newly Discovered Vulnerabilities

A critical SQL injection vulnerability (CVE-2026-26980) in Ghost CMS is being actively exploited in the wild ^[2].
Wireshark 4.6.6 was released to address one vulnerability and fix 11 bugs ^[5].

Notable Threat Actor Activity

The TrapDoor campaign is conducting a coordinated cross-ecosystem software supply chain attack targeting npm, PyPI, and Crates.io to distribute credential-stealing malware ^[1].

Trends, Tools, or Tactics of Interest

Attackers are increasingly leveraging supply chain vectors across multiple software ecosystems and developer platforms, as evidenced by the TrapDoor campaign affecting npm, PyPI, and Crates.io, as well as the Megalodon attack compromising thousands of GitHub repositories via malicious CI/CD workflows ^[1]^[6].

Sources

Over 5,500 GitHub Repositories Infected in ‘Megalodon’ Supply Chain Attack - securityweek.com
Ghost CMS SQL injection flaw exploited in large-scale ClickFix campaign - bleepingcomputer.com
Wireshark 4.6.6 Released, (Sun, May 24th) - isc.sans.edu
TrapDoor Supply Chain Attack Spreads Credential-Stealing Malware via npm, PyPI, and CratesIO - thehackernews.com