CVE-2023-36736

Code execution via undisclosed unsafe deserialization

Published Sep 12, 2023 · Updated Oct 30, 2025

Unsafe deserialization in Microsoft Identity Broker 1.0.0 through 1.6.0 allows local users to execute code through a crafted file. Microsoft identifies untrusted-data deserialization but has not published the affected parser, file format, or unsafe operation. Exploitation requires a user to open the attacker-supplied file and can expose or modify data, with no reported service interruption.

CVSS severity4.4
Medium
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Microsoft Identity Broker 1.0.0 through 1.6.0 allows local users to execute code through a crafted file. Microsoft identifies untrusted-data deserialization but has not published the affected parser, file format, or unsafe operation. Exploitation requires a user to open the attacker-supplied file and can expose or modify data, with no reported service interruption.

The record

CVE
CVE-2023-36736
Published
Sep 12, 2023
Updated
Oct 30, 2025
Vendor
Microsoft
Product
Microsoft Identity Broker
Classifications
CWE-502, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <1.6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Identity Brokerversion=1.0.0 <1.6.1

Published CVSS scores

4.4Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1204.002User Execution: Malicious File

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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