Switzerland
CHE
Large-scale DDoS attacks disrupt Threema messaging services
Large-scale DDoS attacks against Threema and an infrastructure partner caused temporary unavailability, partial availability and delayed or failed message delivery beginning on 11 August 2026. Threema Work business customers were specifically warned of unstable service conditions, while independently hosted Threema On-Prem deployments were not affected.
66
Estimated severity
66 / 100
90
Source reliability
90 / 100
Approximate Date
11/08/2026
Targeted Company
THREEMA
Targeted Company Supply Chain Impact
Distribution & Fulfillment
Procurement & Sourcing
Production & Manufacturing
Sales (Retail & Ecommerce)
Warehousing
Service Delivery
Unrecognized Impact
Supply Chain Relations
No information
Geographic Impact
Country Targeted Company
Other Affected Countries
No other affected countries reported
Target country
Switzerland
Affected countries
No information
Impacted regions
No information
Operational Impact
Duration
No information
Financial impact (USD M)
No information
Impact types
Service unavailabilityService degradationOperational disruptionDownstream customer disruption
Affected sectors
Technology & IT Services
Affected departments
Information Technology
Attack Profile
Attack types
Distributed denial of service
Attributed threat actors
No information