Security November 2026 Latest record Microsoft Exchange Server Spoofing Vulnerability Recorded 10 Nov 2026 at 18:32 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position.
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CVE Microsoft Security Response Center
Microsoft Exchange Server Spoofing Vulnerability Improper access control in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network.
CVE CVE-2026-118208
Severity Important
CVSS base score 7.1
CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L/E:U/RL:O/RC:C
Impact Spoofing
Exploitation detected No known exploitation (MSRC assessment)
Publicly disclosed No (MSRC assessment)
Exploitability Exploitation Less Likely
Component Microsoft Exchange Server
Weakness Not stated
Issued by Microsoft
Customer action Required: follow the MSRC remediation guidance
Affected products Microsoft Exchange Server Subscription Edition RTM
Updates that fix it KB5133453: Microsoft Exchange Server Subscription Edition RTM (restart required)
CISA KEV Not listed in the collected catalog
EPSS No EPSS score collected
Public detection template No Nuclei template listed
Published 10 Nov 2026 08:00 UTC
Last revised 10 Nov 2026 08:00 UTC
Revision note Information published.
Microsoft security releases Complete at observationRead 10 Nov 2026 at 18:30 UTC
CISA KEV Complete at observationRead 10 Nov 2026 at 18:30 UTC
FIRST EPSS Complete at observationRead 10 Nov 2026 at 18:30 UTC
Public detection templates (Nuclei) Complete at observationRead 10 Nov 2026 at 18:30 UTC Coverage describes the sources at this observation. A complete read then does not establish their current position.
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