CVE-2026-40374Network attack vector

Authenticated sensitive-value disclosure via unmasked flow logs

Published May 12, 2026 · Updated May 12, 2026

Information disclosure in Microsoft Power Automate for desktop 2.62 through 2.66 allows remote authenticated users to read sensitive values in logs. A global sensitive variable used in a local subflow is written to Power Automate portal execution logs instead of being masked. Access requires an authorized portal account able to view the affected flow logs, and the consequence is limited to disclosure of logged variable values.

CVSS severity6.5
Medium
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Microsoft Power Automate for desktop 2.62 through 2.66 allows remote authenticated users to read sensitive values in logs. A global sensitive variable used in a local subflow is written to Power Automate portal execution logs instead of being masked. Access requires an authorized portal account able to view the affected flow logs, and the consequence is limited to disclosure of logged variable values.

The record

CVE
CVE-2026-40374
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Microsoft
Product
Power Automate for desktop
Classifications
CWE-200
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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?

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

  1. Affected versionversion=1.0.0.0 <2.67

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Power Automate for desktopversion=1.0.0.0 <2.67

Published CVSS scores

6.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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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