CVE-2026-62912Network attack vector

Authenticated service interrupt via deserialization

Published Aug 11, 2026 · Updated Aug 25, 2026

Deserialization of untrusted data in Microsoft Exchange Server before August 2026 updates allows remote authenticated users to interrupt service. Microsoft's public records identify only an Exchange deserialization path that processes untrusted data; they do not name the exposed component, message type, or code path that accepts attacker-controlled data before deserializing it. Reachability requires valid Exchange credentials and network access to the affected server, and the published impact is bounded to availability with no stated capability to read data, modify data, or execute code.

CVSS severityUnavailable
Unscored
EPSS probability1.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Microsoft Exchange Server before August 2026 updates allows remote authenticated users to interrupt service. Microsoft's public records identify only an Exchange deserialization path that processes untrusted data; they do not name the exposed component, message type, or code path that accepts attacker-controlled data before deserializing it. Reachability requires valid Exchange credentials and network access to the affected server, and the published impact is bounded to availability with no stated capability to read data, modify data, or execute code.

The record

CVE
CVE-2026-62912
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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