Vulnerability

CVE-2026-45501

Medium· 6.5CVSS6.5EPSS0%

.rules3/5

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.

Threat signal

65/100

Elevated

Severity

medium

CVSS

6.5

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

6.5/ 10MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredLowStandard user privileges sufficient.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactNoneNo integrity impact.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.10%

probability of exploitation in next 30 days

p28

higher than 28% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-45501. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-09Vendor advisory · microsoftCVE-2026-45501 — Microsoft Exchange Server Spoofing Vulnerability
2026-06-09Published
2026-06-09Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

microsoftCVE-2026-45501Microsoft Exchange Server Spoofing Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45501

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.