CVE-2026-55008: 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 15.02.1544.043Patch KB5103214 - 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 15.02.2562.045Patch KB5103212 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.01.2507.071Patch KB5103215
Event History
Frequently Asked Questions
What is the severity of CVE-2026-55008?
CVE-2026-55008 has a severity rating of 9.6, classified as critical.
How do I fix CVE-2026-55008?
To fix CVE-2026-55008, apply the latest security updates provided by Microsoft for your version of Microsoft Exchange Server.
What exploits are associated with CVE-2026-55008?
CVE-2026-55008 allows unauthorized attackers to perform spoofing attacks via improper input neutralization in web page generation.
Which versions of Microsoft Exchange Server are affected by CVE-2026-55008?
CVE-2026-55008 affects Microsoft Exchange Server 2019, 2016, and the Subscription Edition RTM.
What are the potential impacts of CVE-2026-55008?
The potential impacts of CVE-2026-55008 include unauthorized access and manipulation of data due to spoofing vulnerabilities.