CVE-2025-59249CWE-1390

CVE-2025-59249

High · published October 14, 2025

CVSS v3.1
8.8
EPSS
1%
Percentile
57.0
In the wild
Unconfirmed
What it is

⚡ A simple authentication flaw in Microsoft Exchange Server could let attackers escalate their privileges like a VIP guest slipping backstage — and it’s absolutely no fun for system admins! Think of it like a concert where authorized access is granted, but the security guard is taking coffee breaks. An attacker with a valid ticket could waltz right past security and claim the stage, leading to a chaotic performance! If exploited, an attacker could gain elevated privileges over the network, allowing them to access sensitive data or disrupt services. This could lead to data breaches or system outages, creating a security nightmare for teams trying to keep everything running smoothly.

Put simply

Think of it like a concert where authorized access is granted, but the security guard is taking coffee breaks. An attacker with a valid ticket could waltz right past security and claim the stage, leading to a chaotic performance! This vulnerability arises from weak authentication mechanisms in Microsoft Exchange Server, allowing an authorized user to manipulate session privileges and gain greater access than intended.

What to do

If exploited, an attacker could gain elevated privileges over the network, allowing them to access sensitive data or disrupt services. This could lead to data breaches or system outages, creating a security nightmare for teams trying to keep everything running smoothly. To protect your systems, ensure that you apply the latest security updates from Microsoft. Regularly audit user access permissions and implement multi-factor authentication to strengthen security measures. You’ve got this! Follow these steps, and you’ll be one step closer to patching that vulnerability and enhancing your security posture! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00826 · 57.0th percentile
Weakness
CWE-1390 · Weak Authentication
Published
2025-10-14T21:16Z
Affected products (38)
ProductVersionsFixed in
microsoft/exchange_serverall versions—
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microsoft/exchange_serverall versions—
microsoft/exchange_server_subscription_edition< 15.02.2562.02915.02.2562.029
References (1)
EPSS history
Timeline
  • 14 OCT 17:00Z
    Microsoft Exchange Server Elevation of Privilege Vulnerability
    cvelistv5