CVE-2026-48579: CWE-285: Improper Authorization in Microsoft Microsoft Exchange Online
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-48579) in Microsoft Exchange Online involves improper authorization (CWE-285), enabling an attacker without privileges to access sensitive information over the network. The CVSS 3.1 vector indicates the attack requires no privileges or user interaction and can be exploited remotely, resulting in high confidentiality and integrity impact without affecting availability. Microsoft has published an official fix to remediate this issue.
Potential Impact
Exploitation of this vulnerability allows unauthorized disclosure of sensitive information in Microsoft Exchange Online. The confidentiality and integrity of data can be compromised, but availability is not impacted. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security update referenced in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579 to remediate this vulnerability.
CVE-2026-48579: CWE-285: Improper Authorization in Microsoft Microsoft Exchange Online
Description
Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.
CVSS v3.1
Score 9.1critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-48579) in Microsoft Exchange Online involves improper authorization (CWE-285), enabling an attacker without privileges to access sensitive information over the network. The CVSS 3.1 vector indicates the attack requires no privileges or user interaction and can be exploited remotely, resulting in high confidentiality and integrity impact without affecting availability. Microsoft has published an official fix to remediate this issue.
Potential Impact
Exploitation of this vulnerability allows unauthorized disclosure of sensitive information in Microsoft Exchange Online. The confidentiality and integrity of data can be compromised, but availability is not impacted. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security update referenced in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-21T20:00:35.246Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579","vendor":"Microsoft"}]
Threat ID: 6a2200c9e29bf47b50d9ee97
Added to database: 06/04/2026, 22:48:41 UTC
Last enriched: 07/29/2026, 22:09:11 UTC
Last updated: 07/31/2026, 21:26:45 UTC
Views: 89
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