Microsoft Exchange Server
CVE-2026-70279 — Microsoft Exchange Server Spoofing Vulnerability
Executive Summary
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Overview
9.3
CVSS CRITICAL
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Changed
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.1
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
4 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 | 5128898 (Security Update) |
Important | Spoofing | No |
| Microsoft Exchange Server 2019 Cumulative Update 14 | 5128897 (Security Update) |
Important | Spoofing | No |
| Microsoft Exchange Server 2019 Cumulative Update 15 | 5128896 (Security Update) |
Important | Spoofing | No |
| Microsoft Exchange Server Subscription Edition RTM | 5128895 (Security Update) |
Important | Spoofing | No |
Patches
4 patches
| Article | Type | Restart |
|---|---|---|
5128898 |
Security Update | No |
5128897 |
Security Update | No |
5128896 |
Security Update | No |
5128895 |
Security Update | No |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
P1hcn
References
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