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CVE-2026-62913: Microsoft Exchange Server Remote Code Execution Vulnerability
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-11 · updated 2026-10-30
- Weakness: CWE-122
Description
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
Affected products
- Microsoft Exchange Server: 2016-cumulative_update_1, 2016-cumulative_update_10, 2016-cumulative_update_11, 2016-cumulative_update_12, 2016-cumulative_update_13, 2016-cumulative_update_14 (+29); 2016, 2019
- Microsoft Exchange Server Subscription Edition: before 15.02.2562.046 — fixed in 15.02.2562.046
- Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0.0 before 15.01.2507.072 — fixed in 15.01.2507.072
- Microsoft Exchange Server 2019 Cumulative Update 14: from 15.02.0.0 before 15.02.1544.044 — fixed in 15.02.1544.044
- Microsoft Exchange Server 2019 Cumulative Update 15: from 15.02.0.0 before 15.02.1748.049 — fixed in 15.02.1748.049
- Microsoft Exchange Server Subscription Edition RTM: from 15.02.0.0 before 15.02.2562.046 — fixed in 15.02.2562.046
How to fix
Upgrade to a fixed version: Microsoft Exchange Server Subscription Edition 15.02.2562.046; Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.072; Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.044; Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.049; Microsoft Exchange Server Subscription Edition RTM 15.02.2562.046. Check the vendor advisory for mitigations.
In the news
References
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