CVE-2026-4387Public exploit

Session hijacking via reusable cleartext authentication state

Published May 29, 2026 · Updated May 29, 2026

Cleartext credential storage in StrongDM Desktop Application before 23.74.0 allows local users to hijack authenticated sessions on Windows. The client writes a JWT and asymmetric key pair unencrypted to C:\Users<username>.sdm\state.kv, then accepts a copied file on another host as the original user's session. Exploitation requires local read access to the affected profile, user-level access on a Windows host, an installed client, and successful file replacement while the application runs.

CVSS severity2.0
Low
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext credential storage in StrongDM Desktop Application before 23.74.0 allows local users to hijack authenticated sessions on Windows. The client writes a JWT and asymmetric key pair unencrypted to C:\Users<username>.sdm\state.kv, then accepts a copied file on another host as the original user's session. Exploitation requires local read access to the affected profile, user-level access on a Windows host, an installed client, and successful file replacement while the application runs.

The record

CVE
CVE-2026-4387
Published
May 29, 2026
Updated
May 29, 2026
Vendor
StrongDM
Product
StrongDM Desktop Application
Classifications
CWE-312, CWE-522, T1552.001, T1550.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 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=0 <23.74.0
  2. Affected versionversion=0 <53.77.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

StrongDM · StrongDM Desktop Applicationversion=0 <23.74.0; version=0 <53.77.0

Published CVSS scores

2.0StrongDMCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/SA:L

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
CWE-522Insufficiently Protected Credentials
T1552.001Unsecured Credentials: Credentials In Files
T1550.001Use Alternate Authentication Material: Application Access Token

Public exploit references

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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