CVE-2026-45503
Microsoft Exchange Server Information Disclosure Vulnerability
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Exchange Server Information Disclosure Vulnerability
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
- Record
CVE-2026-45503- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Weakness
- CWE-285
- Updated
- 2026-11-02
EUVDEUVD-2026-35679
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
- Record
EUVD-2026-35679- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-p44w-fhq3-v2jv
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose...
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
- Record
GHSA-p44w-fhq3-v2jv- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-285, CWE-918
- Updated
- 2026-11-02
NVD
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
- Record
CVE-2026-45503- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-285, CWE-918
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-45503 is a high vulnerability (CVSS 8.1) in Microsoft Exchange Server, published June 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 38th percentile. No source names a fixed version.