CVE-2025-59249
published 2025-10-14CVE-2025-59249: Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
PriorityP259high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
0.83%
57.2th percentile
Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected
46 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
| microsoft | exchange_server | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Attacker must be authenticated and a member of an admin group to exploit; monitor for admin group membership changes or unexpected admin-level Exchange operations by non-privileged users. ↗
- →Post-exploitation activity includes mailbox takeover, sending/reading emails, and downloading attachments — monitor Exchange audit logs for anomalous mailbox access, delegation changes, or mass email activity from admin accounts. ↗
- →Exploitation is network-based; monitor for unusual lateral movement or privilege escalation activity originating from internal hosts targeting Exchange Server over the network. ↗
- ·Exploitation is currently assessed as unlikely and has not been publicly disclosed or observed in the wild as of the advisory date. ↗
- ·Customer action is required — patches are available via Microsoft support articles (KB5066369, KB5066368, KB5066367, KB5066366); apply the relevant update for your Exchange Server version. ↗
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_msrc8.8HIGH
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Microsoft
Microsoft Exchange Server Elevation of Privilege Vulnerability
vendor_msrc·2025-10-14·CVSS 8.8
CVE-2025-59249 [HIGH] CWE-1390 Microsoft Exchange Server Elevation of Privilege Vulnerability
Microsoft Exchange Server Elevation of Privilege Vulnerability
Description: Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
FAQ: What privileges could be gained by an attacker who successfully exploited the vulnerability?
The attacker would be able to take over the mailboxes of all Exchange users, attackers can send emails, read emails, download attachments.
FAQ: How could an attacker exploit this vulnerability?
An attacker would first have to compromise with a user account who is member of an admin group to run the required code.
Microsoft Exchange Server: Microsoft Exchange Server
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Elevation of Privilege
Exploit Status: Publicly Disclosed:No;Exploited:No;
GHSA
GHSA-9x3p-h9v5-qfph: Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network
ghsa_unreviewed·2025-10-14
CVE-2025-59249 [HIGH] CWE-1390 GHSA-9x3p-h9v5-qfph: Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network
Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
No detection rules found.
No public exploits indexed.
Qualys
Microsoft and Adobe Patch Tuesday, October 2025 Security Update Review | Qualys
blogs_qualys·2025-10-14
Microsoft and Adobe Patch Tuesday, October 2025 Security Update Review | Qualys
#### Table of Contents
- Microsoft Patch Tuesday for October 2025
- Adobe Patches for October 2025
- Zero-day Vulnerabilities Patched in October Patch Tuesday Edition
- Critical Severity Vulnerabilities Patched in October Patch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
- Rapid Response with TruRisk Eliminate
- Automating Risk Elimination and Accelerating Response: Meet Agent Sara
- EVALUATE Vendor-Suggested Mitigation withPolicy Audit
- Qualys Monthly Webinar Series
As cybersecurity threats evolve, Microsoft’s October 2025 Patch Tuesday delivers one of the most comprehensive security updates of the year. Here’s a quick breakdown of what you need t
Qualys
Microsoft and Adobe Patch Tuesday, October 2025 Security Update Review
blogs_qualys·2025-10-14
Microsoft and Adobe Patch Tuesday, October 2025 Security Update Review
## Table of Contents
Microsoft Patch Tuesday for October 2025
Adobe Patches for October 2025
Zero-day Vulnerabilities Patched in October Patch Tuesday Edition
Critical Severity Vulnerabilities Patched in October Patch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities inVulnerability Management, Detection & Response (VMDR)
Rapid Response with TruRisk Eliminate
Automating Risk Elimination and Accelerating Response: Meet Agent Sara
EVALUATE Vendor-Suggested Mitigation withPolicy Audit
Qualys Monthly Webinar Series
As cybersecurity threats evolve, Microsoft’s October 2025 Patch Tuesday delivers one of the most comprehensive security updates of the year. Here’s a quick breakdown of what you need to know.
## Mi
Bleepingcomputer
Microsoft October 2025 Patch Tuesday fixes 6 zero-days, 172 flaws
blogs_bleepingcomputer·2025-10-14·CVSS 7.8
[HIGH] Microsoft October 2025 Patch Tuesday fixes 6 zero-days, 172 flaws
## Microsoft October 2025 Patch Tuesday fixes 6 zero-days, 172 flaws
## Lawrence Abrams
80 Elevation of Privilege Vulnerabilities
11 Security Feature Bypass Vulnerabilities
31 Remote Code Execution Vulnerabilities
28 Information Disclosure Vulnerabilities
11 Denial of Service Vulnerabilities
10 Spoofing Vulnerabilities
When BleepingComputer reports on the Patch Tuesday security updates, we only count those released today by Microsoft. Therefore, the number of flaws does not include those fixed in Azure, Mariner, Microsoft Edge, and other vulnerabilities earlier this month.
Notably, Windows 10 reaches the end of support today , with this being the last Patch Tuesday where Microsoft provides free security updates to the venerable operating system.
To continue receiving security upd
2025-10-14
Published