{"id":45165,"date":"2026-04-07T04:02:51","date_gmt":"2026-04-06T20:02:51","guid":{"rendered":"https:\/\/nuoya.nuoyayasuo.top\/index.php\/2026\/04\/07\/disgruntled-researcher-leaks-bluehammer-windows-zero-day-exploit\/"},"modified":"2026-04-07T04:02:51","modified_gmt":"2026-04-06T20:02:51","slug":"disgruntled-researcher-leaks-bluehammer-windows-zero-day-exploit","status":"publish","type":"post","link":"https:\/\/nuoya.nuoyayasuo.top\/index.php\/2026\/04\/07\/disgruntled-researcher-leaks-bluehammer-windows-zero-day-exploit\/","title":{"rendered":"Disgruntled researcher leaks \u201cBlueHammer\u201d Windows zero-day exploit"},"content":{"rendered":"\n

\"Disgruntled<\/p>\n

Exploit code has been released for an unpatched Windows privilege escalation flaw reported privately to Microsoft, allowing attackers to gain SYSTEM or elevated administrator permissions.<\/p>\n

Dubbed BlueHammer, the vulnerability was published by a security researcher discontent with how Microsoft’s Security Response Center (MSRC) handled the disclosure process.<\/p>\n

Since, the security issue has no official patch and there is no update to address it, the flaw is considered a zero-day by Microsoft’s definition<\/a>.<\/p>\n

\"Disgruntled<\/a> <\/div>\n

It is unclear what triggered the public release of the exploit code. In a short post<\/a> under the alias Chaotic Eclipse, the researcher says “I was not bluffing Microsoft, and I’m doing it again.”<\/p>\n

“Unlike previous times, I’m not explaining how this works; y’all geniuses can figure it out. Also, huge thanks to MSRC leadership for making this possible,” the researcher added.<\/p>\n

On April 3rd, Chaotic Eclipse published a GitHub repository for the BlueHammer vulnerability exploit under the alias Nightmare-Eclipse, expressing disbelief and frustration at how Microsoft decided to address the security issue.<\/p>\n

“I’m just really wondering what was the math behind their decision, like you knew this was going to happen and you still did whatever you did ? Are they serious ?”<\/p>\n

The researcher also noted that the proof-of-concept (PoC) code contains bugs that may prevent it from working reliably.<\/p>\n

Will Dormann, principal vulnerability analyst at Tharros (formerly Analygence), confirmed to BleepingComputer that the BlueHammer exploit works<\/a>, saying that the flaw is a local privilege escalation (LPE) that combines a TOCTOU (time-of-check to time-of-use) and a path confusion.<\/p>\n

He explained that the issue is not easy to exploit and that it gives a local attacker access to the Security Account Manager (SAM) database, which contains password hashes for local accounts.<\/p>\n

Given this access, attackers can escalate to SYSTEM privileges and potentially achieve complete machine compromise.<\/p>\n

“At that point, [the attackers] basically own the system, and can do things like spawn a SYSTEM-privileged shell,” Dormann told BleepingComputer.<\/p>\n

\n
\"Disgruntled
Exploit demo<\/strong>
Source: Will Dormann<\/em><\/figcaption><\/figure>\n<\/div>\n

Some researchers testing the exploit confirmed that the code was not successful on Windows Server, confirming Chaotic Eclipse’s statement that there are bugs that may prevent it from working properly.<\/p>\n

Will Dormann added that on the Server platform, the BlueHammer exploit increases permissions from non-admin to elevated administrator, a protection that requires the user to temporarily authorize an operation that needs full access to the system.<\/p>\n

While the reason behind Chaotic Eclipse\/Nightmare-Eclipse’s disclosure remains uncertain, Dormann notes that one requirement from MSRC when submitting a vulnerability is to provide a video of the exploit.<\/p>\n

Although this may help Microsoft sift through reported vulnerabilities more easily, it adds to the effort of submitting a valid report.<\/p>\n

Despite BlueHammer requiring a local attacker to exploit it, the risk it poses is still significant, as hackers can gain local access through a variety of vectors, including social engineering, leveraging other software vulnerabilities, or through credential-based attacks.<\/p>\n

BleepingComputer has contacted Microsoft for a comment on the BlueHammer flaw, but we did not receive a response by publication time.<\/p>\n