Breachsense

Breachsense is a threat-intelligence platform that monitors ransomware group leak sites, dark-web forums, and credential breach databases to track victim disclosures and threat actor activity. Its core methodology is continuous crawling of the extortion sites where ransomware groups post victim data to pressure payment, producing a real-time count of leak-site claims that captures victims regardless of whether they have publicly reported an incident or paid a ransom. For May 2026, Breachsense logged 646 victims claimed across active ransomware leak sites, compared with 95 disclosed attacks recorded by BlackFog for the same month, a ratio of approximately 7:1.

The divergence between Breachsense's count and BlackFog's figure is not a discrepancy in data quality; the two platforms measure different things. BlackFog counts confirmed incidents, typically those that an organisation has acknowledged or that a government body has recorded. Breachsense counts leak-site postings, which include victims who have not yet disclosed, victims who paid before data was posted (but whose existence was listed as leverage), and cases where the posting is a negotiation tactic rather than a confirmed exfiltration. The gap of roughly 551 incidents is the disclosed-versus-actual floor: the number of victims who, in May, were in the extortion pipeline but outside any official count.

Breachsense competes with platforms such as Ransomwatch, DarkFeed, and Ransomlooker in the leak-site monitoring segment of the commercial threat-intelligence market. The significance of its count extends beyond cyber Incident Response: the May 2026 figure landed during Parliamentary scrutiny of the UK Cyber Security and Resilience Bill, whose ransomware-payment reporting regime had been dropped at report stage. The Breachsense-versus-BlackFog gap is the quantified evidence base that the dropped regime was designed to close.