PT-2026-7395 · Microsoft · Windows Storage+1

Oscar Zanotti Camp · Published 2026-02-10 · Updated 2026-03-31 · CVE-2026-21508

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows (affected versions not specified)

Description An improper authentication issue in Windows Storage can allow an attacker to elevate privileges locally. The issue involves forcing a system process utilizing the undocumented function Windows Storage! SHCoCreateInstance to create an arbitrary COM object. This is achieved by manipulating the first argument of a CoCreateInstance call. The vulnerability requires the COM object to be associated with a registered COM class supporting CLSCTX INPROC SERVER.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

LPE

Improper Authentication

Untrusted Search Path

Weakness Enumeration

CWE-287

CWE-426

Related Identifiers

BDU:2026-01809

CVE-2026-21508

Affected Products

Windows

Windows Storage

References · 14

• 🔥 https://github.com/0xc4r/CVE-2026-21508_POC · Exploit
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21508 · Security Note
• https://bdu.fstec.ru/vul/2026-01809 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21508 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-21508 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-21508 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21508 · Security Note
• https://reddit.com/r/SecOpsDaily/comments/1s8pyog/micropatches_released_for_windows_storage · Reddit Post
• https://twitter.com/0patch/status/2038992101401116980 · Twitter Post
• https://twitter.com/BlckC0d3/status/2022637480411881863 · Twitter Post
• https://reddit.com/r/SecOpsDaily/comments/1s8uzyk/secopsdaily_20260331_roundup · Reddit Post
• https://twitter.com/co11ateral/status/2022243321666547943 · Twitter Post
• https://twitter.com/autumn_good_35/status/2039000261738602847 · Twitter Post
• https://t.me/cveNotify/151849 · Telegram Post