Cybersecurity Brief – 2026-04-28

Tue, 28 Apr 2026 00:00:00 +0000

Major Incidents or Breaches

Checkmarx has confirmed that data from its GitHub repositories was leaked on the dark web following a supply chain attack on March 23. The TeamPCP supply chain campaign has been linked to this and other concurrent compromises, including Bitwarden CLI and xinference PyPI.
Home security provider ADT suffered a breach affecting 5.5 million individuals, with the ShinyHunters extortion group claiming responsibility for stealing personal information.
Medtronic, a major medical device manufacturer, confirmed a breach after hackers claimed to have accessed up to 9 million records. The ShinyHunters group is also linked to this incident.
Itron, an energy and water management firm, reported unauthorized access to its systems detected on April 13.
Vercel disclosed a security incident, as noted in Checkpoint’s latest threat intelligence bulletin.
The elementary-data package on PyPI (with 1.1 million monthly downloads) was compromised to distribute information-stealing malware targeting developer data and cryptocurrency wallets.

Microsoft patched a privilege escalation flaw in Entra ID’s AI agent administrative role, which could enable service principal takeover.
Microsoft confirmed active exploitation of Windows Shell vulnerability CVE-2026-32202, which has been patched.
An unpatched Windows ‘PhantomRPC’ flaw was disclosed, with five exploit paths allowing privilege escalation via RPC architectural weaknesses.
An incomplete Windows patch left systems vulnerable to zero-click attacks, previously exploited by Russia-linked APT28 against Ukraine and EU targets.
A 15-year-old OpenSSH flaw was disclosed, allowing full root shell access due to certificate principal parsing issues.
A race condition vulnerability in Linux PackageKit, dubbed ‘Pack2TheRoot’, enables unprivileged users to escalate privileges during package installation.
Firefox vulnerability CVE-2026-6770, now patched in Firefox 150 and Tor 15.0.10, allowed fingerprinting of Tor users.

PhantomCore, a pro-Ukrainian hacktivist group, has been actively targeting Russian TrueConf video conferencing servers since September 2025.
UNC6692, a newly identified threat actor, is conducting campaigns using Microsoft Teams, AWS S3 buckets, and custom “Snow” malware variants (Snowbelt, Snowglaze, Snowbasin). Their tactics include social engineering, email bombing, and cloud resource abuse.
ShinyHunters has claimed responsibility for the recent breaches of ADT and Medtronic, threatening to leak stolen data.
Silk Typhoon: A Chinese national alleged to be part of this group was extradited to the US for cyberespionage activities targeting US interests.

Researchers discovered 73 malicious Visual Studio Code extensions on the Open VSX repository delivering GlassWorm v2 malware, with the campaign leveraging “sleeper” extensions that activate malicious payloads post-update.
Malicious prompt injection attacks against AI systems are increasing, though most remain low in sophistication according to Google.
Deepfake voice attacks are becoming more prevalent, with reports showing that as little as three seconds of audio can enable successful cloning for fraud schemes.
The “fast16” malware framework, dating back 20 years and predating Stuxnet, has been uncovered and is believed to have been used in early cyber sabotage operations.
The Robinhood account creation process was exploited to send phishing messages via legitimate notification emails.
Supply chain attacks remain a key threat, with concurrent compromises (Checkmarx, Bitwarden CLI, xinference PyPI, npm worm “CanisterSprawl”) reported as part of ongoing campaigns.
Americans lost over $2.1 billion to social media scams in 2025, according to the FTC.
Canadian authorities arrested three individuals in Toronto for operating an “SMS blaster” device to send mass phishing texts.

The US government has launched a sweeping crackdown on Southeast Asian cyberscam operations and imposed sanctions on a Cambodian senator for involvement.