CVE-2026-55008

critical

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.

References

Advisories
References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55008

https://www.theregister.com/security/2026/07/14/patchpocalypse-now-microsoft-tops-last-months-record-with-622-patch-tuesday-cves/5271434

https://www.securityweek.com/microsoft-patches-record-622-vulnerabilities-including-two-exploited-zero-days/

https://www.darkreading.com/vulnerabilities-threats/records-broken-patch-tuesday-raises-triage-stakes

https://thehackernews.com/2026/07/microsoft-patches-record-622-flaws.html

https://securityaffairs.com/195347/security/patch-tuesday-security-updates-for-july-2026-the-largest-update-ever-621-cves-in-one-month.html

Details

Source: Mitre, NVD

Published: 2026-07-14

Updated: 2026-07-15

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.6

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H