This record tracks a ransomware attack claimed by the
everest group against
Fiserv. It collects the publicly disclosed attack details — sector, location and
timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAP
Window Zero is the time the breach stayed in the open before
anyone said so — the gap between when the attack was first discovered
on the operator's leak site (t1) and when it was publicly disclosed (t2).
The wider this window, the longer victims, staff and customers were exposed with no warning.
131days open
t1 · Published
t2 · Pending
Business Category
Finance / Legal / Insurance
Leak Status
leaked
checked 2026-09-08
Disclosed / Notified
Not disclosed yet
Attack Summary
[AI generated] Fiserv is a global financial technology company headquartered in Milwaukee, Wisconsin, United States. It provides financial services technology solutions including payment processing, core banking systems, digital banking platforms, and merchant acquiring services. Serving banks, credit unions, retailers, and businesses worldwide, Fiserv operates across the fintech and banking technology industry and is one of the largest providers of financial services infrastructure globally.
Leak Screenshots
1 CAPTURED
Captured directly from the operator's leak site by our collector, last checked 2026-09-08. Verdict evidence: [M1] Download the full dump of Fiserv data now.
Capture history —
2 day(s) tracked. Content is locked.
Showing the latest capture only
Unlock the 2 captures already taken.
Dark Web Exposure
Findings for fiserv.com
— indexed by HaveIBeenRansom.
2,377
found in Infostealer logs
2,252+
found in Traditional breaches
748+
found in Ransomware leaks
Televerde
play · ransomware
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
TheUnderground - Reborn · breach
••• emails
Database World ROC · breach
••• emails
+ 17 more leak sources locked
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