Key Takeaways
- 22 major breaches have been publicly confirmed since 2010, hitting governments and Fortune 500 firms.
- 157 critical vulnerabilities were disclosed in 2025 – roughly double the 78 reported in 2024.
- Azure and Dynamics 365 saw a 9× surge in critical bugs in 2025 alone.
- 40% of 2025 vulnerabilities were Elevation of Privilege flaws, giving attackers a fast path from a foothold to full control.
The Story Behind the Numbers
There’s no single answer to “how many times has Microsoft been hacked?” – it depends on how you count.
If you mean vulnerabilities (the doors hackers walk through), Microsoft disclosed 1,273 in 2025 alone, with 157 rated critical – roughly double the 78 critical bugs reported in 2024.
If you mean major publicly confirmed breaches of Microsoft systems or its products, the count since 2010 sits at roughly 22 incidents. The list includes the July 2025 SharePoint ToolShell attack that hit 400+ servers (including the U.S. nuclear weapons agency), the 2024 Midnight Blizzard intrusion into Microsoft executive email, and the 2023 Storm-0558 attack affecting ~25 organizations including U.S. government agencies.
Both numbers tell the same story: Microsoft is one of the world’s most-targeted software vendors.
The Full Microsoft Breach Timeline (2010-2025)
| Date | Incident | Impact |
|---|---|---|
| Jul 2025 | SharePoint ToolShell mass exploitation (CVE-2025-49706, CVE-2025-49704) | 400+ servers compromised globally; victims included U.S. National Nuclear Security Administration |
| Jul 2024 | DDoS attack on Azure and Microsoft 365 | ~10 hours of global outages |
| Jan 2024 | Midnight Blizzard (Russian SVR) password spray | Microsoft executive, legal, and cybersecurity team emails accessed |
| Sep 2023 | Storm-0558 follow-up disclosure | 60,000 U.S. State Department emails stolen |
| Jul 2023 | Storm-0558 Microsoft Cloud breach (China) | ~25 organizations and 500+ individuals, incl. U.S. State and Commerce Departments |
| Oct 2022 | BlueBleed – misconfigured Azure storage | 548,000 users / 65,000 companies exposed |
| Mar 2022 | Lapsus$ group breach | Source code for Bing, Cortana, and Bing Maps stolen |
| Aug 2021 | Azure Cosmos DB flaw (“ChaosDB”) | Thousands of customer databases exposed, incl. Fortune 500 |
| Aug 2021 | Power Apps misconfiguration | 38 million records across 47 organizations |
| Apr 2021 | LinkedIn data scrape | 500 million user profiles posted for sale |
| Jan 2021 | Microsoft Exchange Server zero-days (Hafnium, China) | 30,000-60,000 organizations worldwide |
| Dec 2020 | SolarWinds / Nobelium supply chain attack | Microsoft was a victim; thousands of government & enterprise targets |
| Dec 2019 | Customer support database exposed via misconfiguration | 250 million records publicly accessible for ~26 days |
| Apr 2019 | Support agent credentials compromised | Outlook.com / Hotmail / MSN webmail metadata accessed |
| Nov 2016 | Skype account hijacking wave | Hundreds of accounts used to send spam |
| May 2016 | Hotmail credentials found for sale | 33 million credentials in a 272M-record cache |
| Oct 2013 | Internal Microsoft bug-tracking database compromised | Hackers obtained list of unpatched Windows bugs; not disclosed until 2017 |
| Mar 2013 | Xbox Live prize-draw data leak | ~3,000 user records exposed |
| 2011–2013 | Xbox Underground intrusions | Repeated breaches of Microsoft developer systems |
| Jun 2012 | Flame malware with forged Microsoft certificate | ~1,000 targeted machines |
| Dec 2010 | BPOS cloud service misconfiguration | “Small number” of business customer contact books exposed |
| Jan 2010 | Internet Explorer zero-day (Operation Aurora) | Used to breach Google, Adobe, and other major U.S. companies |
Why This Data is Important
Microsoft isn’t just another software company – its products run governments, banks, hospitals, and most of the Fortune 500. When Microsoft has a bad year, everyone has a bad year.
The 2025 figures show a worrying shift. Total vulnerabilities dipped 6% from 2024’s record of 1,360, but critical vulnerabilities doubled. Attackers are pivoting hard toward identity, not code:
- Azure and Dynamics 365 saw a 9× jump in critical bugs (from 4 to 37)
- Elevation of Privilege flaws made up 40% of all 2025 vulnerabilities
- Many recent state-sponsored attacks now target credentials, not just zero-days
Translation: hackers want the keys, not just the door. Reusing a Microsoft password – or skipping multi-factor authentication – is what turns a distant vulnerability into a personal one.
Looking Ahead: Future Outlook
Don’t expect 2026 to slow down. AI is accelerating vulnerability discovery on both sides – defenders find bugs faster, but so do attackers, and the gap between disclosure and exploitation is shrinking. Expect more identity-focused attacks like password spraying and token theft. Patch fast, turn on MFA, stop reusing passwords, and consider tools that hide your IP when logging into sensitive accounts.
Source & Methodology
Vulnerability counts come from BeyondTrust’s 13th Annual Microsoft Vulnerabilities Report (April 2026), drawn from Microsoft’s own 2025 security bulletins. The 22-incident timeline is compiled from multiple sources – each incident in the table links to its individual source – and includes Microsoft’s January 2024 SEC Form 8-K on the Midnight Blizzard breach, the only cyber incident Microsoft has formally disclosed to the SEC since the SEC’s December 2023 cyber-disclosure rule took effect.