CVE-2026-77910

HIGH

MEDIUM Priority: 0.08 BB Relevance: 68/100

Published: 2026-10-13 Modified: 2026-10-29 First seen: 2026-10-29 Status: active

Network Low Complexity No Interaction Conf. Impact Integ. Impact

AV: Network

AC: Low

PR: Low

UI: None

S: Unchanged

C: High

I: High

A: High

Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Vendor	Product	Version
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	15.01.0.0 < 15.01.2507.077
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	15.01.0.0 < 15.01.2507.077
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	15.01.0.0 < 15.01.2507.077
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	15.02.0.0 < 15.02.1544.050
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	15.02.0.0 < 15.02.1544.050
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	15.02.0.0 < 15.02.1544.050
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	15.02.0.0 < 15.02.1748.055
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	15.02.0.0 < 15.02.1748.055
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	15.02.0.0 < 15.02.1748.055
Microsoft	Microsoft Exchange Server Subscription Edition RTM	15.02.0.0 < 15.02.2562.056
Microsoft	Microsoft Exchange Server Subscription Edition RTM	15.02.0.0 < 15.02.2562.056
Microsoft	Microsoft Exchange Server Subscription Edition RTM	15.02.0.0 < 15.02.2562.056

vendor-advisory patch

68 / 100

✓ Network accessible
✓ Low complexity
✓ No user interaction

8.8 / 10.0 v3.1

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

0.87%

Raw Score 0.008670

Percentile 58.6%

Date 2026-10-29

2026-10-29

0.00867

2026-10-28

0.00867

mitre ref →