Threema — Cyber Threats, Attacks & Incidents

Threat entity extracted from intelligence sources

Frequency
5
occurrences
First Seen
February 7, 2026
Last Seen
September 4, 2026

Related Threat Clusters

  • EU Cybersecurity Standards Published Amid Ongoing Breaches

    The European Telecommunication Standards Institute has released 17 cybersecurity standards that vendors must adhere to for compliance with the EU Cyber Resilience Act, effective December 2027. These standards outline…

    2 articles · Updated August 17, 2026
  • Large-Scale DDoS Attacks Disrupt Threema Messaging Service

    Threema, a secure messaging service, experienced significant disruptions due to multiple large-scale DDoS attacks earlier this week. Users reported outages starting on August 15, 2026, particularly affecting those in…

    4 articles · Updated August 16, 2026
  • Microsoft Patches Critical Vulnerabilities Amid Dropbox Account Breach

    Microsoft has released patches for nine vulnerabilities in various cloud services, including Entra ID and Azure Cosmos DB, requiring no action from users. In a separate incident, approximately 5,000 Dropbox accounts…

    2 articles · Updated September 4, 2026
  • Phishing Attacks via Signal Targeting German Officials and Journalists

    Germany's BfV and BSI have issued a warning regarding phishing attempts via the Signal messaging app. The attacks are believed to be conducted by state or state-controlled actors, targeting high-ranking officials in…

    12 articles · Updated February 6, 2026

Recent Intelligence Reports

  • In Other News: Microsoft's Cloud Patches, Hacked Dropbox Accounts, Guardio's $1.1B Valuation — Securityweek · September 4, 2026
  • Risky Bulletin: The EU publishes its upcoming cybersecurity standards — News.Risky.Biz · August 17, 2026
  • DDoS Attacks Cause Major Threema Outages — Securityaffairs.Co · August 16, 2026
  • Large — Bleepingcomputer · August 16, 2026
  • Signal Under Siege: How Russian-Linked Hackers Are Exploiting the Encrypted ... — Webpronews · February 7, 2026

CVSS v3.1 Breakdown