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Microsoft under fire for threatening researcher who exposed unpatched vulnerabilities
The flaws affect widely used Microsoft software

Microsoft under fire for threatening researcher who exposed unpatched vulnerabilities

May 30, 2026
09:33 am

What's the story

Microsoft is facing backlash after threatening a security researcher, known as "Nightmare Eclipse," with legal action and police involvement. The controversy erupted when the researcher publicly disclosed a number of unpatched vulnerabilities in Microsoft products, including BlueHammer, RedSun UnDefend, and YellowKey. These flaws were found in widely used software such as the Windows Defender antivirus engine and the BitLocker disk-encryption tool.

Disclosure debate

Company's complaint against Nightmare Eclipse

Microsoft's main complaint against Nightmare Eclipse is that they didn't report the bugs first, giving the company a chance to fix them. The tech giant argued that this would have been a "responsible" approach. Furthermore, Microsoft contended that by disclosing details of these vulnerabilities and their exploitation methods before they were fixed, Nightmare Eclipse may have inadvertently assisted malicious hackers.

Security concerns

Microsoft claims vulnerabilities were exploited in real-world attacks

Microsoft and the US cybersecurity agency CISA have claimed that some of the vulnerabilities disclosed by Nightmare Eclipse were exploited by hackers in real-world attacks. The company has threatened legal action against those who enable such criminal activity, saying its Digital Crimes Unit will continue pursuing cases against them. This unit's mission is to protect Microsoft through civil legal actions, technical countermeasures, criminal referrals, and public-private partnerships.

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Allegations

Nightmare Eclipse accuses Microsoft of mistreatment

In a series of blogs, Nightmare Eclipse alleged that they were mistreated by Microsoft. This included the revocation of their access to the Microsoft Security Response Center account, where researchers can report vulnerabilities. The researcher implied that they had no choice but to publicly disclose these vulnerabilities, which essentially turned them into zero-days, security flaws unknown to the affected software maker at the time of disclosure or exploitation.

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Ethical dilemma

Controversy has sparked a debate over researchers' responsibilities

The public spat between Microsoft and Nightmare Eclipse has reignited a long-standing debate over the responsibilities of independent security researchers. While it is widely accepted that researchers should be compensated for their work, the question remains: do they have a duty to ensure that vulnerabilities they find are fixed? Many in the cybersecurity community have criticized Microsoft's handling of this issue, including Luta Security founder Katie Moussouris and former Microsoft employee Kevin Bueaumont.

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