CVE-2026-45503 — HIGH (8.1)

Q: What is CVE-2026-45503?

CVE-2026-45503 is a vulnerability with a CVSS score of 8.1 (HIGH). Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

Q: How severe is CVE-2026-45503?

CVE-2026-45503 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-45503?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.

Vulnerability Description

Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

CVSS Score

8.1

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Microsoft	Exchange Server	2016
Microsoft	Exchange Server Subscription Edition	< 15.02.2562.043

Related Weaknesses (CWE)

CWE-285 CWE-918

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45503Vendor Advisory

FAQ

What is CVE-2026-45503?

CVE-2026-45503 is a vulnerability with a CVSS score of 8.1 (HIGH). Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

How severe is CVE-2026-45503?

CVE-2026-45503 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-45503?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.