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Vulnerabilities

Vulnerability · CVE-2026-45501

CVE-2026-45501 is listed by Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network..

Published Jun 9, 2026 · catalog updated Jul 28, 2026 · exchange server subscription edition

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-45501. EPSS is 0.40%. Act only if a listed version of exchange server subscription edition is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.40%
Remediation
Version ranges on file
Affected products
cpe microsoft/exchange server · cpe microsoft/exchange server subscription edition

CVE-2026-45501 is listed by Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network..

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/exchange server2016
  • cpe microsoft/exchange server2019
  • cpe microsoft/exchange server subscription edition< 15.02.2562.043

How to fix CVE-2026-45501

  • Upgrade

    CVE-2026-45501 lists a fix boundary at 15.02.2562.043. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 15.02.2562.043

  • Advisory

    Open the inventory_critical record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-45501. EPSS is 0.40%. Act only if a listed version of exchange server subscription edition is installed.

Which versions are affected?

Compare what you have installed with microsoft/exchange server 2016; microsoft/exchange server 2019; microsoft/exchange server subscription edition < 15.02.2562.043. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS); CWE-918: Server-Side Request Forgery (SSRF). EPSS 0.40%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Microsoft Exchange Server security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 9, 2026 · Monitored products — critical

    Detected

    CVE-2026-45501 is listed by Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network..

  2. Jul 28, 2026 · Monitored products — critical

    Updated

    CVE-2026-45501 is listed by Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network..

Sources

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — criticalNov 1, 2026