CVE-2026-96951: Microsoft Windows Command Injection Vulnerability

What it is

Improper neutralization of special elements used in a command (‘command injection’) in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

Description quoted from the CVE record (assigned by microsoft, published 2026-10-13).

Weakness: CWE-77: Improper Neutralization of Special Elements used in a Command (‘Command Injection’)

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and a user must take an action. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: no. Technical impact: total.

On CISA KEV since

2026-10-13

US federal deadline

2026-10-16

Ransomware use

Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2026-16527, EUVD-2026-100274, GHSA-hjr5-mppg-mjq7

VEDAS cluster: VEDAS:BARNACLEBLASTER

Exploit Observer has no public exploit code that names this CVE or one of its aliases.

Research and write-ups (3)

• Research or write-up: https://pbxscience.com/windows-shell-zero-day-cve-2026-96951-exploited-in-the-wild-what-you-need-to-know-and-how-to-patch
• Research or write-up: https://socprime.com/blog/cve-2026-96951-analysis
• Research or write-up: https://www.tenable.com/blog/microsofts-october-2026-patch-tuesday-addresses-1407-cves-cve-2026-96951

Vulnerability databases and vendor advisories (6)

Catalogue entries, not exploit evidence.

• Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-100274
• Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-hjr5-mppg-mjq7
• Vulnerability database or vendor advisory: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-96951
• Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-96951
• Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96951
• Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-96951

News (1)

• News: https://www.techgines.com/post/windows-shell-zero-day-cve-2026-96951

118 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS

0.098
some chance of attack soon

VEDAS

0.969
strong exploit evidence

On CISA KEV

Yes, since 2026-10-13

Detection rule

None yet

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.

Who is affected

1 more products are listed in the CVE record.

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: microsoft outlook_web, microsoft windows_10_1607, microsoft windows_10_1809, microsoft windows_10_21h2, microsoft windows_10_22h2, microsoft windows_11_23h2, microsoft windows_11_24h2, microsoft windows_11_25h2, microsoft windows_11_26h1, microsoft windows_11_26h2.

How to fix it

Fixed versions stated in the CVE record: 154.0.4258.62, 20260925.100, 10.0.14393.9612, 10.0.17763.9376, 10.0.19044.7807, 10.0.19045.7807, 10.0.22631.7652, 10.0.26100.9711, 10.0.26200.9711, 10.0.28000.3231, 10.0.26300.9711, 6.3.9600.23470 and others.

CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset’s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Vendor guidance:

• Windows Shell Security Feature Bypass Vulnerability (vendor-advisory, patch)

How to detect it

There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.

References

Vendor advisories and patches

• Windows Shell Security Feature Bypass Vulnerability (vendor-advisory, patch)

Government sources

• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96951 (government-resource)

Other databases

• CVE record (cve.org)
• NVD
• Exploit Observer

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.