Awareness and guidance related to potential Service Fabric Explorer (SFX) v1 web client risk

Summary Microsoft was recently made aware of a Cross-Site Scripting XSS vulnerability CVE-2022-35829, that under limited circumstances, affects older versions of Service Fabric Explorer SFX. The current default SFX web client SFXv2 is not vulnerable to this attack. However, customers can manually...

What’s the smallest variety of CHERI?

The Portmeirion project is a collaboration between Microsoft Research Cambridge, Microsoft Security Response Center, and Azure Silicon Engineering & Solutions. Over the past year, we have been exploring how to scale the key ideas from CHERI down to tiny cores on the scale of the cheapest...

Service Fabric Privilege Escalation from Containerized Workloads on Linux

Under Coordinated Vulnerability Disclosure CVD, cloud-security vendor Palo Alto Networks informed Microsoft of an issue affecting Service Fabric SF Linux clusters CVE-2022-30137. The vulnerability enables a bad actor, with access to a compromised container, to escalate privileges and gain control...

Anatomy of a Security Update

The Microsoft Security Response Center is part of the defender community and on the front line of security response for our customers and the company. Our mission is to protect customers and Microsoft from current and emerging threats related to security and privacy. We monitor threats and provid...

Windows DNS サーバーの脆弱性情報 CVE-2020-1350 に関する注意喚起

本記事は、「July 2020 Security Update: CVE-2020-1350 Vulnerability in Windows Domain Name System DNS Server」の日本語抄訳です。 本日、脆弱性情報 CVE-2020-1350 を公開し...

January 2020 Security Updates: CVE-2020-0601

The January security updates include several Important and Critical security updates. As always, we recommend that customers update their systems as quickly as practical. Details for the full set of updates released today can be found in the Security Update Guide. We believe in Coordinated...

From sixteen to methodical: Firas Fatnassi’s evolution as a security researcher

Firas has been interested in technology for as long as he can remember. Growing up in Tunisia, he was drawn to mobile phones, gaming consoles, and anything that hinted at how systems worked beneath the surface. But for a long time, security research did not feel accessible...

Congratulations to the top MSRC 2025 Q2 security researchers!

Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2025 Q2 Security Researcher Leaderboard are wkai, Brad...

BlueHat October 2023 Call for Papers is Now Open!

As you may have seen on social media, the next BlueHat conference will be October 11 – 12, 2023, on Microsoft’s Redmond campus in Washington state, USA. The Call for Papers CFP is now open through August 18, 2023. The BlueHat community is a unique blend of security researchers and responders from...

Announcing the Xbox Bounty program

Announcing the new Xbox Bounty. The Xbox bounty program invites gamers, security researchers, and technologists around the world to help identify security vulnerabilities in the Xbox network and services, and share them with the Microsoft Xbox team through Coordinated Vulnerability Disclosure CVD...

2019 年 1 月のセキュリティ更新プログラム (月例)

2019/01/16 更新: 新たに定例外で公開した Team Foundation Server の脆弱性 CVE-2019-0646/CVE-2019-0647、...

Analysis and mitigation of speculative store bypass (CVE-2018-3639)

In January, 2018, Microsoft published an advisory and security updates for a new class of hardware vulnerabilities involving speculative execution side channels known as Spectre and Meltdown. In this blog post, we will provide a technical analysis of an additional subclass of speculative executio...

ActiveX Control issue being addressed in Update Tuesday

Late last Friday, November 8, 2013, a vulnerability, CVE-2013-3918, affecting an Internet Explorer ActiveX Control was publically disclosed. We have confirmed that this vulnerability is an issue already scheduled to be addressed in “Bulletin 3”, which will be released as MS13-090, as listed in th...

Zero Day Quest 2025: $1.6 million awarded for vulnerability research

This month, the Microsoft Security Response Center recently welcomed some of the world’s most talented security researchers at Microsoft’s Zero Day Quest, the largest live hacking competition of its kind. The inaugural event challenged the security community to focus on the highest-impact securit...

Announcing the Adaptive Prompt Injection Challenge (LLMail-Inject)

We are excited to introduce LLMail-Inject, a new challenge focused on evaluating state-of-the-art prompt injection defenses in a realistic simulated LLM-integrated email client. In this challenge, participants assume the role of an attacker who sends an email to a user. The user then queries the...

Awareness and guidance related to potential Service Fabric Explorer (SFX) v1 web client risk

Summary Summary Microsoft was recently made aware of a Cross-Site Scripting XSS vulnerability CVE-2022-35829, that under limited circumstances, affects older versions of Service Fabric Explorer SFX. The current default SFX web client SFXv2 is not vulnerable to this attack. However, customers can...

Azure Database for PostgreSQL Flexible Server Privilege Escalation and Remote Code Execution

MSRC was informed by Wiz, a cloud security vendor, under Coordinated Vulnerability Disclosure CVD of an issue with the Azure Database for PostgreSQL Flexible Server that could result in unauthorized cross-account database access in a region. By exploiting an elevated permissions bug in the Flexib...

Announcing the Launch of the Azure SSRF Security Research Challenge

Microsoft is excited to announce the launch of a new, three-month security research challenge under the Azure Security Lab initiative. The Azure Server-Side Request Forgery SSRF Research Challenge invites security researchers to discover and share high impact SSRF vulnerabilities in Microsoft...

Microsoft Joins Open Source Security Foundation

Microsoft has invested in the security of open source software for many years and today I’m excited to share that Microsoft is joining industry partners to create the Open Source Security Foundation OpenSSF, a new cross-industry collaboration hosted at the Linux Foundation. The OpenSSF brings...

March 2020 security updates are available

We have released the March 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 in the Security Update Guide. The post March 2020...

May 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. MSRC team...

Defending against CVE-2015-1769: a logical issue exploited via a malicious USB stick

Introduction Today Microsoft released update MS15-085 to address CVE-2015-1769, an important severity security issue in Mount Manager. It affects both client and server versions, from Windows Vista to Windows 10. The goal of this blog post is to provide information on the detection guidance to he...

INTERN(al) MSRC variant hunting: From multi-tenant authorization to Model Context Protocol

When security researchers submit a vulnerability report to MSRC, the Vulnerabilities and Mitigations V&M team reviews it, reproduces the issue, and determines severity. The team reviews all submissions from internal and external security researchers...

Microsoft Investigation – Threat actor consent phishing campaign abusing the verified publisher process

Summary On December 15th, 2022, Microsoft became aware of a consent phishing campaign involving threat actors fraudulently impersonating legitimate companies when enrolling in the Microsoft Cloud Partner Program MCPP formerly known as Microsoft Partner Network MPN. The actor used fraudulent partn...

Security Update Guide Improvement – Representing Hotpatch Updates

Today we are updating the way Microsoft Security Update Guide SUG represents the Windows Hotpatch feature to make it easier for users to identify the hotpatch and security updates. Hotpatching was introduced a year ago as a new way to install updates on supported Windows Server Azure Edition...

Microsoft Mitigates Vulnerability in Jupyter Notebooks for Azure Cosmos DB

Summary Microsoft recently fixed an authentication bypass vulnerability in Jupyter Notebooks for Azure Cosmos DB currently in preview reported by Orca Security. Customers not using Jupyter Notebooks 99.8% of Azure Cosmos DB customers do NOT use Jupyter notebooks were not susceptible to this...

New Research Paper: Pre-hijacking Attacks on Web User Accounts

In 2020, MSRC awarded two Identity Project Research Grants to support external researchers working to further strengthen the security of identity protocols and systems. Today we are pleased to release the results of the first of these projects. This research, led by independent security researche...

2021 年 9 月のセキュリティ更新プログラム (月例)

更新 9 月 17 日： 9 月の月例セキュリティ更新日に公開した Open Management Infrastructure OMI の脆弱性 CVE-2021-38645, CVE-2021-38649, CVE-2021-38648, CVE-2021-38647 に関して、追加のガイダン...

Announcing MSRC 2019 Q4 Security Researcher Leaderboard

Following the first Security Researcher Quarterly Leaderboard we published in October 2019, we are excited to announce the MSRC Q4 2019 Security Researcher Leaderboard, which shows the top contributing researchers for the last quarter. In each quarterly leaderboard, we recognize the security...

Announcing the Microsoft Identity Research Project Grant

We are excited to announce the Microsoft Identity Research Project Grant a new opportunity in partnership with the security community to help protect Microsoft customers. This project grant awards up to $75,000 USD for approved research proposals that improve the security of the Microsoft Identit...

Fix it tool available to block Internet Explorer attacks leveraging CVE-2014-0322

Today, we released Security Advisory 2934088 to provide guidance to customers concerned about a new vulnerability found in Internet Explorer versions 9 and 10. This vulnerability has been exploited in limited, targeted attacks against Internet Explorer 10 users browsing to www.vfw.org and...

MS13-080 addresses two vulnerabilities under limited, targeted attacks

Today we released MS13-080 which addresses nine CVEs in Internet Explorer. This bulletin fixes multiple security issues, including two critical vulnerabilities that haven been actively exploited in limited targeted attacks, which we will discuss in details in this blog entry. CVE-2013-3893: the...

Announcing the winners of the Adaptive Prompt Injection Challenge (LLMail-Inject)

We are excited to announce the winners of LLMail-Inject, our first Adaptive Prompt Injection Challenge! The challenge ran from December 2024 until February 2025 and was featured as one of the four official competitions of the 3rd IEEE Conference on Secure and Trustworthy Machine Learning IEEE...

Results of Major Technical Investigations for Storm-0558 Key Acquisition

March 12, 2024 update As part of our continued commitment to transparency and trust outlined in Microsoft’s Secure Future Initiative, we are providing further information as it relates to our ongoing investigation. This new information does not change the customer guidance we previously shared, n...

Azure AD アプリケーションにおける特権昇格の潜在的なリスクについて

本ブログは、Potential Risk of Privilege Escalation in Azure AD Applications の抄訳版です。最新の情報は原文を参照してください。 概要...

Mitigation for Azure Storage SDK Client-Side Encryption Padding Oracle Vulnerability

Summary Google informed Microsoft under Coordinated Vulnerability Disclosure CVD of a padding oracle vulnerability that may affect customers using Azure Storage SDK for Python, .NET, Java client-side encryption CVE-2022-30187. To mitigate this vulnerability, we released a new General Availability...

Cyber threat activity in Ukraine: analysis and resources

UPDATE 02 MAR 2022: See Updated malware details and Microsoft security product detections below for additional insights and protections specific to the evolving threats we have identified impacting organizations with ties to Ukraine. Microsoft has been monitoring escalating cyber activity in...

Time for day 2 of briefings at BlueHat Seattle!

We hope you enjoyed the first day of our BlueHat briefings and the Bytes of BlueHat reception in our glamping tent complete with toasted marshmallows. Yesterday, we learned a lot about how XboxOne hardware security has advanced the state of hardware security elsewhere, we heard some surprising...

日本セキュリティチーム ブログ移行のお知らせ

日本セキュリティチーム ブログが、新しいプラットフォームに移行してアドレスが変更になりました。旧アドレス https://blogs.technet.microsoft.com/jpsecurity/ をブラウザのお気に入りに登録や、RSS フィードの登録等で利用されている方は、お手数ですが、新たなアドレス https://aka.ms/jpsecurity へ変更をお願いします。...

The MSRC 2017 list of “Top 100” security researchers

Security researchers play an essential role in Microsoft’s security strategy and are key to community-based defense. To show our appreciation for their hard work and partnership, each year at BlackHat North America, the Microsoft Security Response Center highlights contributions of these...

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,...

Rising star: Meet Dylan, MSRC’s youngest security researcher

At just 13 years old, Dylan became the youngest security researcher to collaborate with the Microsoft Security Response Center MSRC. His journey into cybersecurity is inspiring—rooted in curiosity, resilience, and a deep desire to make a difference. Early beginnings: From scratch to security...

BlueHat India Call for Papers is Now Open!

You asked for it and it’s finally here! The inaugural BlueHat India conference will be held May 16-17th, 2024, in Hyderabad, India! This intimate conference will bring together a unique blend of security researchers and responders, who come together as peers to exchange ideas, experiences, and...

Microsoft mitigates China-based threat actor Storm-0558 targeting of customer email

UPDATE: Microsoft performed a comprehensive technical investigation into the acquisition of the Microsoft account consumer signing key, including how it was used to access enterprise email. Our technical investigation has concluded, and on September 6, 2023, we published our investigation finding...

Publishing CBL-Mariner CVEs on the Security Update Guide CVRF API

Microsoft is pleased to announce that beginning January 11, 2023, we will publish CBL-Mariner CVEs in the Security Update Guide SUG Common Vulnerability Reporting Framework CVRF API. CBL-Mariner is a Linux distribution built by Microsoft to power Azure’s cloud and edge products and services and i...

Hunting for Cobalt Strike: Mining and plotting for fun and profit

Introduction Introduction Cobalt Strike is a commercial Command and Control framework built by Helpsystems. You can find out more about Cobalt Strike on the MITRE ATT&CK page. But it can also be used by real adversaries. In this post we describe how to use RiskIQ and other Microsoft technologies ...

CVE-2022-23278 Microsoft Defender for Endpointのなりますましの脆弱性に関するガイダンス

本ブログは、Guidance for CVE-2022-23278 spoofing in Microsoft Defender for Endpoint の抄訳版です。最新の情報は原文を参照してください。 マイク...

Update on the vulnerability in the Azure Cosmos DB Jupyter Notebook Feature

On August 12, 2021, a security researcher reported a vulnerability in the Azure Cosmos DB Jupyter Notebook feature that could potentially allow a user to gain access to another customers resources by using the accounts primary read-write key. We mitigated the vulnerability immediately. Our...

Azure Sphere Security Research Challenge Now Open

The Azure Sphere Security Research Challenge is an expansion of Azure Security Lab, announced at Black Hat in August 2019. At that time, a select group of talented researchers was invited to come and do their worst, emulating criminal hackers in a customer-safe cloud environment. This new researc...

CVE-2013-3893: Fix it workaround available

Today, we released a Fix it workaround tool to address a new IE vulnerability that had been actively exploited in extremely limited, targeted attacks. This Fix it makes a minor modification to mshtml.dll when it is loaded in memory to address the vulnerability. This Fix it workaround tool is link...