CVE-2026-50267

TLS private-key disclosure via world-readable temporary files

Published Jun 17, 2026 · Updated Jun 17, 2026

Cleartext credential storage in Steeltoe.Configuration.Abstractions 4.0.0 through 4.1.0 allows local users to read TLS private keys. ConfigurationDictionaryMapper.MapFromToFile writes VCAP_SERVICES sslKey values with File.CreateText into Path.GetTempPath(), inheriting mode 0644 and leaving the files undeleted. Exploitation requires a different-UID process sharing the container filesystem; disclosure enables application impersonation to the mutual-TLS database.

CVSS severity4.7
Medium
EPSS probability0.07%
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 Steeltoe.Configuration.Abstractions 4.0.0 through 4.1.0 allows local users to read TLS private keys. ConfigurationDictionaryMapper.MapFromToFile writes VCAP_SERVICES sslKey values with File.CreateText into Path.GetTempPath(), inheriting mode 0644 and leaving the files undeleted. Exploitation requires a different-UID process sharing the container filesystem; disclosure enables application impersonation to the mutual-TLS database.

The record

CVE
CVE-2026-50267
Published
Jun 17, 2026
Updated
Jun 17, 2026
Vendor
Steeltoe
Product
Steeltoe.Configuration.Abstractions
Classifications
CWE-312, CWE-732, T1552.001
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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=>= 4.0.0, < 4.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Steeltoe · Steeltoe.Configuration.Abstractionsversion=>= 4.0.0, < 4.2.0

Published CVSS scores

4.7GitHub, Inc.CVSS:3.1/AV:L/AC:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
CWE-732Incorrect Permission Assignment for Critical Resource
T1552.001Unsecured Credentials: Credentials In Files

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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