CVE-2026-0257 on DanSec Daily

Cybersecurity Brief – 2026-06-02

Tue, 02 Jun 2026 00:00:00 +0000

Major Incidents or Breaches

Dashlane, a password manager, disclosed a brute-force attack resulting in the download of encrypted vaults for fewer than 20 personal users. Affected accounts were automatically locked to prevent further compromise. Users also reported account lockouts due to login attempts from unfamiliar locations and devices ^[3]^[12]^[30].
Over 30 npm packages under Red Hat’s @redhat-cloud-services namespace were compromised in a supply chain attack dubbed “Miasma,” distributing a variant of the Shai-Hulud malware to steal developer credentials and secrets ^[4]^[10].
A malicious supply chain campaign targeted developers using OpenAI Codex via a fraudulent npm package, codexui-android, which was designed to steal authentication tokens ^[8].
Dutch police dismantled a botnet comprising 17 million devices that was used as a residential proxy network and facilitated various cybercrimes ^[33].
Nearly 2,000 WordPress websites were infected with malware that uses Steam Community profile comments to hide command-and-control data ^[13].
A fake BlueWallet application targeting Mac users was observed stealing passwords, crypto wallet information, and clipboard data ^[40].
Threat actor DriveSurge hijacked thousands of websites to distribute malware via ClickFix and FakeUpdate campaigns ^[9].
The Spanish National Police arrested an individual responsible for leaking sensitive data of government employees, including those from the National Cybersecurity Institute (INCIBE) ^[11].
The Instagram accounts of high-profile individuals and organisations were compromised via Meta’s AI support bot, allowing attackers to seize and deface accounts with pro-Iranian content ^[27].

Newly Discovered Vulnerabilities

A critical Windows Netlogon remote code execution vulnerability (CVE-2026-41089) is now being actively exploited. Organisations are urged to patch immediately ^[16]^[34].
A new Linux kernel vulnerability, known as CIFSwitch and present for 19 years, allows low-privileged users to escalate to root. Proof-of-concept exploit code has been released ^[5]^[37].
A vulnerability in the WP Maps Pro WordPress plugin (CVE-2026-8732) is being exploited to allow unauthenticated attackers to create administrative accounts on affected sites ^[32].
Palo Alto Networks PAN-OS authentication bypass vulnerability (CVE-2026-0257) has been under active exploitation since four days after its public disclosure, with at least two observed attack waves ^[5]^[22]^[38].

Notable Threat Actor Activity

China-aligned threat groups launched Operation Dragon Weave, targeting officials and citizens in the Czech Republic and Taiwan with the AdaptixC2 agent for cyber espionage ^[6].
Recent campaigns have seen attackers leveraging SVG files in phishing emails, bypassing traditional detection methods ^[28].
Carnival Corporation, a major cruise line operator, was named among top targets in recent cyber incidents ^[39].

Trends, Tools, or Tactics of Interest

Attack vectors in containerised environments remain focused on exposed secrets, privilege misconfigurations, API compromise, and supply chain attacks ^[1].
Malware campaigns are increasingly using unconventional channels for command-and-control, such as hiding payloads in Steam Community profiles ^[13].
There is a trend towards faster exploitation of vulnerabilities following public disclosure, underscoring the importance of rapid patch management ^[15]^[38].
A new browser-based technique, FROST, enables websites to infer user activity on SSDs using JavaScript, raising concerns over novel tracking vectors ^[26].
MSPs are moving beyond traditional vCISO tools, seeking integrated security growth platforms for broader service delivery ^[7].

Regulatory or Policy Developments Affecting the Security Industry

Anthropic will open its Mythos AI system to the EU’s ENISA as part of Project Glasswing, reflecting deepening cooperation between the European Commission and AI vendors ^[20].
Microsoft’s legal threats against researchers disclosing zero-day exploits have sparked backlash, raising concerns about the chilling effect on vulnerability research ^[21].
Oracle has shifted to a monthly patch cadence, with its first rollout addressing 77 vulnerabilities ^[31].

Sources

Dashlane Discloses Brute-Force Attack, Encrypted Vaults of Fewer Than 20 Users Downloaded - thehackernews.com
Dashlane password manager users locked out by brute force attacks - bleepingcomputer.com
Dashlane Brute-Force Attack Leads to Limited Encrypted Vault Downloads - securityweek.com
Miasma Supply Chain Attack Compromises Red Hat npm Packages with Credential-Stealing Worm - thehackernews.com
Red Hat npm packages compromised to steal developer credentials - bleepingcomputer.com
OpenAI Codex Authentication Tokens Stolen in codexui-android npm Supply Chain Attack - thehackernews.com
Dutch Police Dismantle Massive 17-Million-Device Botnet - securityweek.com
WordPress malware campaign hides payloads in Steam profiles - bleepingcomputer.com
Fake BlueWallet steals passwords, accounts, and crypto from Macs - malwarebytes.com
Hackers hijack thousands of sites for ClickFix and FakeUpdate attacks - bleepingcomputer.com
Spain arrests doxer leaking sensitive data of govt employees - bleepingcomputer.com
Hackers Used Meta’s AI Support Bot to Seize Instagram Accounts - krebsonsecurity.com
Critical Windows Netlogon RCE flaw now exploited in attacks - bleepingcomputer.com
Critical Windows Netlogon Vulnerability in Attackers’ Crosshairs - securityweek.com
⚡ Weekly Recap: New Linux Flaw, PAN-OS Exploit, AI-Powered Attacks, OAuth Phishing and More - thehackernews.com
19-Year-Old Linux Kernel Vulnerability Exposes Systems to Root Access - securityweek.com
WP Maps Pro Vulnerability Exploited to Take Over WordPress Sites - securityweek.com
Patch Now: Another Palo Alto Auth Bypass Bug Under Active Exploit - darkreading.com
Recent Palo Alto Networks Vulnerability Exploited for Weeks - securityweek.com
China-Aligned Groups Ramp Up Attacks: Dragon Weave Hits Czech Republic & Taiwan - thehackernews.com
New Wave Of Phishing Emails with SVG Files, (Tue, Jun 2nd) - isc.sans.edu
1st June – Threat Intelligence Report - research.checkpoint.com
Containers on fire: from container escapes to supply chain attacks - securelist.com
Race Against Time: Why Faster Vulnerability Alerts Matter - bleepingcomputer.com
Websites Can Now Spy on You Through Your Hard Drive - wired.com
The Security Growth Platform: Why MSPs Are Moving Beyond vCISO Tools - thehackernews.com
Anthropic to Open Mythos AI to EU's ENISA - darkreading.com
Microsoft's Zero-Day Legal Threats Spark Backlash - darkreading.com
Oracle’s First Monthly Patches Resolve 77 Vulnerabilities - securityweek.com

Cybersecurity Brief – 2026-05-30

Sat, 30 May 2026 00:00:00 +0000

Major Incidents or Breaches

Charter Communications suffered a data breach affecting 4.9 million accounts, with the ShinyHunters extortion group responsible for stealing and leaking personal information from the US telecom giant in early April ^[16]^[25].
Dutch authorities disrupted a malware botnet comprising 17 million infected devices and seized over 200 servers supporting the operation ^[12].
23andMe, now Chrome Holding Co., is facing a lawsuit from the California Attorney General over a 2023 breach that exposed sensitive customer genetic and personal information ^[10]^[28].
Trump Mobile reportedly exposed customer data in a recent breach ^[24].

Newly Discovered Vulnerabilities

Palo Alto Networks reported that CVE-2026-0257, a medium-severity authentication bypass vulnerability in PAN-OS and Prisma Access, is under active exploitation ^[3].
Researchers disclosed a vulnerability in OpenAI ChatGPT that exploits trust in Markdown links and images, potentially enabling phishing attacks via web summaries ^[4].
A critical argument injection flaw in Gogs, a Git server, allows authenticated attackers to achieve remote code execution via malicious pull requests. The vulnerability has a CVSS score of 9.4 and is considered a zero-day ^[27].
Google Chrome version 148 update addresses 151 vulnerabilities, including critical-severity issues that could lead to remote code execution ^[29].
An exploit chain in a popular cloud automation service combined over-permissioned roles, secrets discovery, and non-human identities, exposing the risk of major compromise in complex cloud integrations ^[19].

Notable Threat Actor Activity

The ShinyHunters extortion gang was responsible for the Charter Communications breach, leaking over 42 million records ^[16]^[25].
A previously undocumented Russia-linked threat actor, GREYVIBE, has been carrying out persistent AI-powered cyberattacks against Ukraine and related entities since at least August 2025 ^[6].
Threat actors are abusing ChatGPT’s content-sharing feature to host fake outage pages, tricking users into downloading malware disguised as a desktop application ^[9].
An unknown threat actor used a large language model (LLM) agent for post-compromise actions after exploiting the Marimo CVE-2026-39987 vulnerability ^[5].
Cybercriminals are impersonating Signal Support in phishing campaigns to steal backup recovery keys, enabling access to victims’ entire message archives ^[30].
Malicious NuGet packages masquerading as a Sicoob SDK were discovered stealing banking credentials, while npm packages targeted cloud secrets ^[8].
Phishing campaigns are targeting the 2026 FIFA World Cup, leveraging event interest for malicious activity ^[24].
The criminal gang known as “The Com” is conducting cyberattacks to financially support violence and sexual exploitation ^[20].

Trends, Tools, or Tactics of Interest

DDoS attacks are increasingly being offered as subscription-based services, featuring pricing tiers, support, and reseller programs, reflecting the professionalization of the DDoS-as-a-Service market ^[11].
The rise of “shadow AI” is evidenced by employees developing and deploying full AI-powered applications into production systems without adequate oversight, resulting in increased exposure and risk ^[7].
There is a trend toward attackers leveraging LLM agents for post-exploitation activities, as seen in the Marimo CVE-2026-39987 incident ^[5].
Attackers are exploiting cloud integration misconfigurations, particularly through over-permissioned roles and secrets exposure, to compromise automation services ^[19].
MokN raised $15 million for a “phish-back” platform that uses decoy access points to lure attackers and capture compromised credentials ^[26].

Regulatory or Policy Developments Affecting the Security Industry

The California Attorney General has initiated legal action against 23andMe (now Chrome Holding Co.) for failing to protect customer data in the wake of its 2023 breach ^[10]^[28].
Google Chrome has rolled out Device Bound Session Credentials (DBSC) to all users, providing enhanced protection against session cookie theft and account takeover ^[13].
Asia’s cyber insurance market is showing signs of increased activity and growth after historically slow uptake ^[18].
The US Cybersecurity and Infrastructure Security Agency (CISA) has responded to recent supply chain attacks, highlighting ongoing government engagement in addressing such threats ^[24].

Sources

Charter Communications data breach affects 4.9 million accounts - bleepingcomputer.com
Charter Communications Data Breach Could Impact Nearly 5 Million - securityweek.com
Dutch govt disrupts malware botnet with 17 million infected devices - bleepingcomputer.com
California AG sues 23andMe over 2023 breach exposing health data - bleepingcomputer.com
California Sues 23andMe, Alleging It Failed to Protect User Data in 2023 Breach - securityweek.com
In Other News: Trump Mobile Data Breach, FIFA World Cup Phishing, CISA Responds to Supply Chain Attacks - securityweek.com
PAN-OS GlobalProtect Authentication Bypass (CVE-2026-0257) Under Active Exploitation - thehackernews.com
ChatGPhish Vulnerability Turns ChatGPT Web Summaries Into a Phishing Surface - thehackernews.com
Gogs Zero-Day Exposes Servers to Remote Code Execution - securityweek.com
Chrome 148 Update Patches 151 Vulnerabilities - securityweek.com
With Complex Cloud Integrations, Small Errors Lead to Major Compromises - darkreading.com
New Russia-Linked GREYVIBE Targets Ukraine with AI-Powered Cyberattacks - thehackernews.com
ChatGPT share links abused to host fake outage pages to deliver malware - bleepingcomputer.com
Attackers Use LLM Agent for Post-Exploitation After Marimo CVE-2026-39987 Exploit - thehackernews.com
Signal users targeted in backup-stealing phishing attacks - malwarebytes.com
Malicious Sicoob NuGet Steals Banking Credentials as npm Packages Target Cloud Secrets - thehackernews.com
'The Com' Cyberattacks Support Violence & Sexploitation - darkreading.com
From $5 Attacks to Botnet-Powered Platforms: Inside the DDoS-as-a- Service Market - bleepingcomputer.com
What 2,000 Exposed Vibe-Coded Apps Reveal About the Limits of Most Security Stacks - thehackernews.com
MokN Raises $15 Million for Phish-Back Platform - securityweek.com
Google Chrome adds session cookie theft protection for all users - bleepingcomputer.com
Asia's Cyber Insurance Market Shows Signs of Life - darkreading.com