Cross-site scripting in Microsoft Exchange Server - CVE-2026-69356
Published: September 8, 2026
Vulnerability identifier: #VU147622
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-69356
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing.
The vulnerability exists due to improper neutralization of input during web page generation (cross-site scripting) in Microsoft Exchange Server when processing a specially crafted calendar invitation containing a malicious meeting link. A remote attacker can send a specially crafted calendar invitation to perform spoofing.
User interaction is required to open the meeting and select the Join link.
Affected software
Microsoft Exchange Server
How to mitigate CVE-2026-69356
Install security update from vendor's website.
Microsoft Exchange Server - addressed in versions SE RTM Sep26SU 15.02.2562.049, 2016 CU23 Sep26SU 15.01.2507.073, 2019 CU14 Sep26SU 15.02.1544.046, 2019 CU15 Sep26SU 15.02.1748.051