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 score of 9.1 reflects that the flaw can be exploited remotely without authentication or user interaction, resulting in high confidentiality and integrity impact. Microsoft has published an official fix to address this vulnerability.
Potential Impact
Successful exploitation allows an unauthorized attacker to disclose sensitive information from Microsoft Exchange Online, compromising confidentiality and integrity. There is no impact on availability reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the vendor-provided patch promptly. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579 for detailed remediation instructions.
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
Affected software
Microsoft
Microsoft Exchange Online
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 score of 9.1 reflects that the flaw can be exploited remotely without authentication or user interaction, resulting in high confidentiality and integrity impact. Microsoft has published an official fix to address this vulnerability.
Potential Impact
Successful exploitation allows an unauthorized attacker to disclose sensitive information from Microsoft Exchange Online, compromising confidentiality and integrity. There is no impact on availability reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the vendor-provided patch promptly. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579 for detailed remediation instructions.
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: 08/14/2026, 13:27:35 UTC
Last updated: 09/14/2026, 10:01:31 UTC
Views: 123
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