CVE-2026-45503
MEDIUMCVSS 6.5/10EPSS 0.45%
Last modified
CVE-2026-45503 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.
Description
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Exchange Server | 2016 | Cumulative Update 23 |
| Microsoft | Exchange Server | 2019 | Cumulative Update 14 |
| Microsoft | Exchange Server Subscription Edition | < 15.02.2562.043 | — |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-45503?
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 a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.
How do I fix CVE-2026-45503?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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Are you affected by CVE-2026-45503?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST