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CVE-2026-118208 Microsoft Exchange Server Spoofing Vulnerability

7.1 highEPSS 0.8%

High (7.1) in microsoft microsoft exchange server subscription edition rtm. EPSS 0.8% estimated probability of exploitation activity in the next 30 days.

On this page
Improper access control in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network.

Severity

CVSS 3.1

7.1 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
EPSS
0.8% estimated probability of exploitation activity in the next 30 days; 58th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-10. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWEs
CWE-15 External Control of System or Configuration Setting
CWE-284 Improper Access Control
OWASP Top 10
A01:2025 Broken Access Control, A02:2025 Security Misconfiguration
Published
Modified
Assigned by
microsoft (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

  • microsoft:microsoft exchange server subscription edition rtm

Versions

From the CNA's record in the CVE List.

ProductAffected
Microsoft Exchange Server Subscription Edition RTMfrom 15.02.0.0 before 15.02.2562.057

Attack patterns (CAPEC)

  • CAPEC-13 Subverting Environment Variable Values Likelihood: High · Severity: Very High
  • CAPEC-69 Target Programs with Elevated Privileges Likelihood: High · Severity: Very High
  • CAPEC-76 Manipulating Web Input to File System Calls Likelihood: High · Severity: Very High
  • CAPEC-77 Manipulating User-Controlled Variables Likelihood: High · Severity: Very High
  • CAPEC-146 XML Schema Poisoning Likelihood: Low · Severity: High
  • CAPEC-176 Configuration/Environment Manipulation Severity: Medium
  • CAPEC-203 Manipulate Registry Information Severity: Medium
  • CAPEC-270 Modification of Registry Run Keys Likelihood: Medium · Severity: Medium
  • CAPEC-271 Schema Poisoning Likelihood: Low · Severity: High
  • CAPEC-579 Replace Winlogon Helper DLL

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-284 (17).

References

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