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CVE-2026-50428Patch(microsoft / windows_11_26h1)

LOWCVSS 5.5 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch microsoft windows_11_26h1 systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Out-of-bounds read in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.

microsoft CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Patch / fix
Weakness type (CWE)
CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • windows_11_26h1

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
microsoft
Products
windows_11_26h1

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-07-15: 1Patch / Workaround · 2026-07-15: 1Technical Details · 2026-07-15: 107-15
Signal classification1 categories
Patch
1100.0%
Referenced assets1 URL
Full discourse1 post
  • Windows Forum@windowsforum
    Patch

    🪟 Windows 11 26H1 has a container leak, but exploiting it requires local authenticated access. Still, KB5101649 is cheaper than letting unionfs.sys turn secrets into souvenirs. https://windowsforum.com/threads/cve-2026-50428-install-kb5101649-to-fix-windows-11-26h1-leak.438447/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #Windows11 #SecurityUpdates #Cve202650428 #UnionfsDriver https://t.co/qm0cgIpqpO

    Post summary

    The tweet alerts readers to a Windows 11 26H1 container leak that needs local authentication, recommends applying KB5101649 to remediate it, and warns that unionfs.sys could expose sensitive secrets.

    0000024
    1.2K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
OSmicrosoftwindows_11_26h1--arm64
OSmicrosoftwindows_11_26h1--x64

Explore more

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