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CVE-2026-45500

Microsoft Exchange Server Spoofing Vulnerability

MEDIUM
6.1
CVSS Score
Published: June 9, 2026 at 05:04 PM UTC
Updated: July 28, 2026 at 11:16 PM UTC
2 products affected across 1 vendorExchange ServerExchange Server Subscription Edition

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Exchange Server· Microsoft
95%
15.01.0.0 ≤ v < 15.01.2507.07115.02.0.0 ≤ v < 15.02.1544.04315.02.0.0 ≤ v < 15.02.1748.04815.01.0.015.02.0.02016 cumulative_update_232019 cumulative_update_142019 cumulative_update_15
Affected range stops below 15.01.2507.071, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.1544.043, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.1748.048, so it looks safe — our inference, not a vendor statement
Exchange Server Subscription Edition· Microsoft
95%
v < 15.02.2562.04315.02.0.0 ≤ v < 15.02.2562.04515.02.0.0
Affected range stops below 15.02.2562.043, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.2562.045, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45500

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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