CVE-2026-45503: CWE-285: Improper Authorization in Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-285 (Improper Authorization), affects Microsoft Exchange Server 2016 Cumulative Update 23 (version 15.01.0.0). It permits an attacker with some level of authorization to access information they should not be able to disclose over the network. The CVSS 3.1 base score is 8.1, indicating high severity, with network attack vector, low attack complexity, and no user interaction required. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized attacker can exploit this vulnerability to disclose sensitive information over the network, potentially compromising confidentiality and integrity of data. There is no indication of impact on availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. It is recommended to apply the provided security update from Microsoft promptly to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-45503: CWE-285: Improper Authorization in Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
Description
Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.
CVSS v3.1
Score 8.1high
Affected software
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft
Microsoft Exchange Server 2019 Cumulative Update 14
Microsoft
Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft
Microsoft Exchange Server Subscription Edition RTM
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-285 (Improper Authorization), affects Microsoft Exchange Server 2016 Cumulative Update 23 (version 15.01.0.0). It permits an attacker with some level of authorization to access information they should not be able to disclose over the network. The CVSS 3.1 base score is 8.1, indicating high severity, with network attack vector, low attack complexity, and no user interaction required. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized attacker can exploit this vulnerability to disclose sensitive information over the network, potentially compromising confidentiality and integrity of data. There is no indication of impact on availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. It is recommended to apply the provided security update from Microsoft promptly to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T16:07:22.619Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45503","vendor":"Microsoft"}]
Threat ID: 6a284cdf8dd33fbd85664da9
Added to database: 06/09/2026, 17:26:55 UTC
Last enriched: 08/14/2026, 13:38:13 UTC
Last updated: 09/13/2026, 10:01:31 UTC
Views: 108
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