Latest cybersecurity reporting from selected sources.

Polymarket confirmed hackers stole funds from some users after attackers injected malicious code through a compromised third-party vendor. Polymarket confirmed that a security breach at a third-party vendor allowed attackers to inject malicious code into its website, leading to the theft of funds from an undisclosed number of users. The company said it has contained […]

Breach Is Among Several Recent Major Incidents Involving Billing Software ProvidersA publicly traded cancer treatment firm notified investors that a yet-undisclosed number of patients' information was compromised in a 2025 cybersecurity incident involving a third-party billing software vendor. The Oncology Institute provides cancer treatment care to nearly 2 million patients.

Incident Involved an Unnamed Third-Party VendorNew York City's municipal healthcare system is notifying nearly 2 million patients of a hacking incident discovered earlier this year involving a third-party vendor. The breach compromised a long list of information, including biometric data such as fingerprints.

Crooks used simple phone scam to compromise vendor account, spilling personal and financial data belonging to more than 15,000 people A voice-phishing scam targeting one of Ericsson's service providers has exposed the personal data of more than 15,000 individuals after attackers sweet-talked an employee into handing over access.…

Spanish flag carrier Iberia has begun notifying customers of a data security incident stemming from a compromise at one of its suppliers. The disclosure comes days after a threat actor claimed on hacker forums to have access to 77 GB of data allegedly stolen from the airline. [...]

SEC Filing Reveals Telecom Vendor Was Compromised for Nearly a YearA nation-state threat actor carried out a supply chain attack targeting Ribbon Communications, a leading U.S. provider of telecom and networking infrastructure, and may have maintained access within its systems for nearly a year. Ribbon said it became aware of the activity in early September.

Spanish fashion retailer MANGO is sending notices of a data breach to its customers, warning that its marketing vendor suffered a compromise exposing personal data. [...]

Outsourcing your helpdesk always seems like a good idea – until someone else's breach becomes your problem Discord has confirmed customers' data was stolen – but says the culprit wasn't its own servers, just a compromised support vendor.…

Crims raided third-party systems and lifted personal data, including license numbers and partial SSNs US insurance giant Farmers Insurance says more than a million customers had personal data nicked after a third-party vendor was compromised.…

Cierant Corp. Says Cleo MFT Zero-Day Exploit Compromised Health Plan Client DataA Connecticut-based firm that provides print and electronic document management services to health plans has reported to regulators that an exploit of a vulnerability in file transfer software from third-party vendor Cleo has resulted in a health data compromise affecting nearly 233,000 people.

345 Major HIPAA Breaches Reported to Feds So Far This Year, Affecting 29.9 MillionMidway through 2025, the federal website listing major health data breaches in the U.S. shows a familiar scene: Many hacking incidents including ransomware, dozens of third-party vendor incidents, and millions of individuals affected by compromised personal data.

Ransomware Attack Taught Lessons on Health Sector Resiliency, Vendor RedundancyIt's been one year since hackers attacked IT services provider Change Healthcare, quickly shutting down critical processes for thousands healthcare entities, triggering a data breach affecting 190 million people. So what top lessons are emerging from that massive disruption and data compromise?

The data leak was not actually due to a breach in Amazon's systems but rather that of a third-party vendor; the supply chain incident affected several other clients as well.

HealthEC Hack Also Compromised More Than a Dozen US Healthcare SystemsA hacking incident at a New Jersey-based vendor of artificial intelligence-enabled population health management services that involved a network server has affected more than a dozen of its healthcare clients across the country and nearly 4.5 million of their patients.

The North Korean Lazarus hacking group repeatedly compromised a software vendor using flaws in vulnerable software despite multiple patches and warnings being made available by the developer. [...]

Company CISO acknowledges compromise of a single customer's creds, says incident is contained The CISO of Swiss cybersecurity firm Acronis has acknowledged a breach of the company’s systems but stated the incident only impacted a single customer and that all other data remains safe.…

AT&T is notifying customers of a Customer Proprietary Network Information compromise, exposing years-old upgrade details.

Mobile vendor confirms that some source code used with its Galaxy devices was breached.