Duo MFA secret disclosure via internal logs
Published Feb 18, 2026 · Updated Feb 18, 2026
Sensitive information exposure in Splunk Enterprise allows remote authenticated users to read Duo MFA secrets from the _internal index. In Search Head Cluster deployments, splunkd writes the Duo integrationKey, secretKey, and appSecretKey values into searchable internal logs without redaction. Exposure requires Duo MFA and an authenticated role permitted to search _internal, and it discloses all three secrets in plaintext.
Summary
What happened
Sensitive information exposure in Splunk Enterprise allows remote authenticated users to read Duo MFA secrets from the _internal index. In Search Head Cluster deployments, splunkd writes the Duo integrationKey, secretKey, and appSecretKey values into searchable internal logs without redaction. Exposure requires Duo MFA and an authenticated role permitted to search _internal, and it discloses all three secrets in plaintext.
The record
- CVE
- CVE-2026-20138
- Published
- Feb 18, 2026
- Updated
- Feb 18, 2026
- Vendor
- Zoom Video Communications, Inc.
- Product
- Splunk Enterprise
- Classifications
- CWE-532, T1552.001
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 18, 2026CVE publishedPublication date reported by the CVE source.
- Feb 18, 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.
- Affected versionversion=10.0 <10.0.2
- Affected versionversion=9.2 <9.2.11
- Affected versionversion=9.3 <9.3.9
- Affected versionversion=9.4 <9.4.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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