February 2015 Updates

Today, as part of Update Tuesday, we released nine security bulletins– three rated Critical and six rated Important in severity, to address 56 unique Common Vulnerabilities and Exposures CVEs in Microsoft Windows, Microsoft Office, Internet Explorer, and Microsoft Server software. We encourage yo...

Bug Bounty Evolution: Online Services

Today marks the next evolution in bounty programs at Microsoft as we launch the Microsoft Online Services Bug Bounty program starting with Office 365. In our mobile first, cloud first world, this is an exciting and logical evolution to our existing bug bounty programs. Office 365 is the first of...

Assessing risk for the July 2014 security updates

Today we released six security bulletins addressing 29 unique CVE’s. Two bulletins have a maximum severity rating of Critical, three have maximum severity Important, and one is Moderate. We hope that the table below helps you prioritize the deployment of the updates appropriately for your...

Assessing risk for the March 2014 security updates

Today we released five security bulletins addressing 23 unique CVE’s. Two bulletins have a maximum severity rating of Critical while the other three have a maximum severity rating of Important. We hope that the table below helps you prioritize the deployment of the updates appropriately for your...

MBSA 2.3 and the November 2013 Security Bulletin Webcast, Q&A, and Slide Deck

Today we’re publishing the November 2013 Security Bulletin Webcast Questions & Answers page. The majority of questions focused on the ActiveX Kill Bits bulletin MS13-090 and the advisories. We also answered a few general questions that were not specific to any of this month’s updates, but that ma...

Security Advisory 2880823: Recommendation to discontinue use of SHA-1

Microsoft is recommending that customers and CA’s stop using SHA-1 for cryptographic applications, including use in SSL/TLS and code signing. Microsoft Security Advisory 2880823 has been released along with the policy announcement that Microsoft will stop recognizing the validity of SHA-1 based...

Zero Day Quest 2026: $2.3 million awarded for vulnerability research

Protecting customers is at the core of Zero Day Quest. During the 2026 live hacking event, Microsoft partnered with the global security research community, representing more than 20 countries and a wide range of professional backgrounds, from high school students to college professors. Together,...

Continuing to Listen: Good News about the Security Update Guide API!

Based on user feedback we have simplified programmatic access to the security update data by removing the authentication and API-Key requirements when using the CVRF API. You will no longer have to log in to obtain a personal API key to access the data. We're happy to make this valuable public...

Security Analysis of CHERI ISA

Is it possible to get to a state where memory safety issues would be deterministically mitigated? Our quest to mitigate memory corruption vulnerabilities led us to examine CHERI Capability Hardware Enhanced RISC Instructions, which provides memory protection features against many exploited...

July 2018 Security Update Release

Today, we released security updates to provide additional protections against malicious attackers. As a best practice, we encourage customers to turn on automatic updates. More information about this month’s security updates can be found on the Security Update Guide...

July 2017 security update release

Today, we released security updates to provide additional protections against malicious attackers. By default, Windows 10 receives these updates automatically, and for customers running previous versions, we recommend they turn on automatic updates as a best practice. More information about this...

Update on Petya malware attacks

As happened recently with WannaCrypt, we again face a malicious attack in the form of ransomware, Petya. In early reports, there was a lot of conflicting information reported on the attacks, including conflation of unrelated and misleading pieces of data, so Microsoft teams mobilized to investiga...

Microsoft releases Security Advisory 2963983

Today, we released Security Advisory 2963983 regarding an issue that impacts Internet Explorer. At this time, we are only aware of limited, targeted attacks. This issue allows remote code execution if users visit a malicious website with an affected browser. This would typically occur by an...

Advance Notification Service for August 2013 Security Bulletin Release

Today we’re providing advance notification for the release of eight bulletins, three Critical and five Important, for August 2013. The Critical updates address vulnerabilities in Microsoft Windows, Internet Explorer and Exchange. As usual, we’ve scheduled the bulletin release for the second Tuesd...

Congratulations to the top MSRC 2026 Q1 security researchers!

Congratulations to all the researchers recognized in this quarter’sMicrosoft Researcher Recognition Programleaderboard! Thank you to everyone for your hard work and continued partnership to secure customers...