CVE-2026-70279ImportantSpoofingNetwork
Microsoft Exchange Server Spoofing Vulnerability
Assessment
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.
- Severity
- Important
- CVSS base score
- 9.3CVSS:3.1/
AV:N/ AC:L/ PR:N/ UI:R/ S:C/ C:H/ I:H/ A:N/ E:U/ RL:O/ RC:C - Impact
- Spoofing
- EPSS, next 30 days
- Not scored yet
- Public exploit code
- No Nuclei template lists it
- Exploitability
- Exploitation More Likely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Microsoft Exchange Server
- Weakness
- CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Issued by
- Microsoft
- Published
- 13 Oct 2026 · October 2026
- Last revised
- 13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
- Attack vector
- NetworkAV:N
- Attack complexity
- LowAC:L
- Privileges required
- NonePR:N
- User interaction
- RequiredUI:R
- Scope
- ChangedS:C
- Confidentiality
- HighC:H
- Integrity
- HighI:H
- Availability
- NoneA:N
Updates that fix it
4 KBs| KB | Type | Applies to | Other CVEs |
|---|---|---|---|
| KB5128895 | Security Update | Microsoft Exchange Server Subscription Edition RTM | All CVEs in KB5128895 |
| KB5128896 | Security Update | Microsoft Exchange Server 2019 Cumulative Update 15 | All CVEs in KB5128896 |
| KB5128897 | Security Update | Microsoft Exchange Server 2019 Cumulative Update 14 | All CVEs in KB5128897 |
| KB5128898 | Security Update | Microsoft Exchange Server 2016 Cumulative Update 23 | All CVEs in KB5128898 |
What changed
First observed 14 Oct 2026No field changes in the recorded history.
Cite this recorded revision to keep the same title, summary, facts and links when the page changes.
A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.