PT-2026-7356 · Unknown+1 · Mailslot File System+1

Published 2026-02-10 · Updated 2026-03-09 · CVE-2026-21253

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 Mailslot File System (affected versions not specified)

Description A flaw exists in the Mailslot File System that could allow a local attacker to gain elevated privileges. The issue is a use-after-free condition. An attacker can exploit this to affect the system.

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

LPE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-01745

CVE-2026-21253

Affected Products

Mailslot File System

Windows

References · 10

• https://nvd.nist.gov/vuln/detail/CVE-2026-21253 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-21253 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21253 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21253 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21253 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-01745 · Security Note
• https://vicarius.io/vsociety/posts/cve-2026-21253-detection-script-elevation-of-privilege-vulnerability-in-mailslot-file-system · Note
• https://vicarius.io/vsociety/posts/cve-2026-21253-mitigation-script-elevation-of-privilege-vulnerability-in-mailslot-file-system · Note
• https://twitter.com/_patchpoint_/status/2027290009641132461 · Twitter Post
• https://twitter.com/vicariusltd/status/2031053400587096093 · Twitter Post