CVE-2026-69378

HIGH

MEDIUM Priority: 0.09 BB Relevance: 75/100

Published: 2026-09-08 Modified: 2026-10-30 First seen: 2026-10-30 Status: active

Network Low Complexity No Auth No Interaction

AV: Network

AC: Low

PR: None

UI: None

S: Unchanged

C: None

I: None

A: High

Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

Vendor	Product	Version
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	15.01.0.0 < 15.01.2507.073
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	15.02.0.0 < 15.02.1544.046
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	15.02.0.0 < 15.02.1748.051
Microsoft	Microsoft Exchange Server Subscription Edition RTM	15.02.0.0 < 15.02.2562.049

vendor-advisory patch

75 / 100

✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

7.5 / 10.0 v3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

1.17%

Raw Score 0.011740

Percentile 67.5%

Date 2026-10-30

mitre ref →