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CVE-2025-26633 is a security feature bypass vulnerability in Microsoft Management Console (MMC). The issue is described as improper neutralization and has been associated with malicious Microsoft Saved Console (.msc) files that abuse MMC’s handling of console resources and MUIPath-related resolution behavior to evade intended security checks. Public reporting has linked exploitation to a technique dubbed “MSC EvilTwin,” in which a benign and a malicious console file are arranged so that launching the expected console causes MMC to resolve and load attacker-controlled content instead. Observed variants also reference abuse of the res:// protocol handler and related MMC content-loading behavior. The vulnerability has been exploited in the wild as a zero-day and used by multiple threat actors to initiate malware delivery on vulnerable Windows systems.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a proof-of-concept exploit for CVE-2025-26633, a local privilege escalation vulnerability in Microsoft Management Console (MMC) on Windows systems. The main file, 'CVE-2025-26633_mmc_addadmin.py', generates a malicious .msc (MMC snap-in) file that, when opened with mmc.exe on a vulnerable Windows system, executes an embedded PowerShell command. This command creates a new local administrator account ('hacker'/'P@ssw0rd123!') silently. The exploit targets unpatched Windows 10, Windows 11, and Windows Server 2016-2025 systems prior to the March 2025 security updates. The attack vector is local, requiring the attacker to convince a user to open the crafted .msc file. The repository includes a README with detailed vulnerability and usage information, and a GPL license file. No network endpoints or remote services are involved; the exploit is purely local and post-exploitation in nature.
This repository is a proof-of-concept (PoC) exploit for CVE-2025-26633, a vulnerability in Microsoft Management Console (MMC) that allows remote code execution via malicious .msc files and ActiveX controls. The repository is structured in three stages: - 'stage1/dropper.ps1' is a PowerShell script that creates and writes malicious .msc files to the Windows System32 directory, replacing a placeholder with a URL pointing to a remote HTML payload, and then launches the MMC with the malicious file. - 'stage2/index.html' is an HTML file containing JavaScript that, when loaded in the MMC context with ActiveX enabled, executes arbitrary PowerShell commands. The default action is to launch calc.exe, but commented lines show how it could download and execute further PowerShell payloads or kill processes. - 'stage3/shell.ps1' is a PowerShell script that downloads a remote executable ('shell.exe') from a specified IP address and runs it. The exploit demonstrates the attack chain from initial file drop to remote code execution, with clear network and file system indicators. The PoC is intended for educational and research purposes only.
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53 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft Management Console (.msc) exploitation technique/vulnerability referred to as GrimResource, involving XSS via apds.dll and the res:// protocol handler to evaluate attacker-controlled JavaScript.
Microsoft Management Console (MMC) vulnerability (MSC EvilTwin) exploited to trigger code execution as part of malware delivery campaigns.
A Microsoft Windows vulnerability exploited as a zero-day (via an MSC EvilTwin technique) to deliver backdoors.
A Microsoft vulnerability that CISA KEV’s knownRansomwareCampaignUse field silently flipped to Known during 2025 (evidence of ransomware campaign use).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.