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CVE-2026-74960VulnerabilityPublished Updated

Microsoft · Site Isolation Issue

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-74960· High 8.1

Not known to be exploited · CVSS 8.1 High.

Data as of 14 Nov 2026, 09:02 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • <154
  • <140.14
  • <153.1
Fixed in
  • 154
  • 140.14
  • 153.1

Description

A site isolation issue has been identified in the WebExtensions component of Microsoft software version 4.0. The vulnerability is cataloged as CVE-2026-74960 and relates to improper access control (CWE-284). No CVSS score or detailed impact information is provided, and no known exploits are reported in the wild. There is no information about available patches or fixes.

References

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