CVE-2026-45500: Microsoft Exchange Server Spoofing Vulnerability
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.
Other sources
Microsoft Exchange Server Spoofing Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.02.2562.045Patch KB5103212 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.01.2507.071Patch KB5103215 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.02.1748.048Patch KB5103213 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.02.1544.043Patch KB5103214
Event History
Frequently Asked Questions
What is the severity of CVE-2026-45500?
The severity of CVE-2026-45500 is medium with a score of 6.1.
How do I fix CVE-2026-45500?
To fix CVE-2026-45500, apply the latest security updates provided by Microsoft for affected versions of Exchange Server.
What systems are affected by CVE-2026-45500?
CVE-2026-45500 affects Microsoft Exchange Server 2019, Microsoft Exchange Server 2016, and both editions of Microsoft Exchange Server Subscription Edition.
What type of vulnerability is CVE-2026-45500?
CVE-2026-45500 is classified as a spoofing vulnerability due to improper input neutralization during web page generation.
What impact does CVE-2026-45500 have on users?
CVE-2026-45500 allows unauthorized attackers to perform spoofing attacks over a network, potentially misleading users.