CVE-2026-96940: microsoft exchange_server Weak Authentication
CVSS: 8.8v3.1HighAnalyzed
Published 02-10-2026Last modified 20-10-2026
Vulnerability summary
CVE-2026-96940 is a high (CVSS 8.8) Weak Authentication vulnerability in microsoft exchange_server. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40.7% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
0.48%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 02-10-2026PublishedVulnerability first disclosed.
- 20-10-2026Last modifiedVulnerability information updated.
Description
Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.48%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
03-10-202621-10-2026
EPSS score0.48%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft6 products
- exchange_server2016:cumulative_update_23 | 2019:cumulative_update_14 | 2019:cumulative_update_15
- exchange_server_subscription_edition< 15.02.2562.053
- microsoft exchange server 2016 cumulative update 23≥ 15.01.0.0, < 15.01.2507.075
- microsoft exchange server 2019 cumulative update 14≥ 15.02.0.0, < 15.02.1544.048
- microsoft exchange server 2019 cumulative update 15≥ 15.02.0.0, < 15.02.1748.053
1 vendor · 6 products
