Administrator code execution via default credentials
Published Feb 20, 2026 · Updated Feb 20, 2026
Authentication bypass in MLflow 3.4.0 allows remote attackers to gain administrator access through packaged default credentials. The basic_auth.ini configuration supplies a fixed administrator username and password when the built-in basic-auth account is first created. A network-reachable server using the basic-auth app and unchanged credentials lets an unauthenticated attacker log in as administrator and execute arbitrary code.
Summary
What happened
Authentication bypass in MLflow 3.4.0 allows remote attackers to gain administrator access through packaged default credentials. The basic_auth.ini configuration supplies a fixed administrator username and password when the built-in basic-auth account is first created. A network-reachable server using the basic-auth app and unchanged credentials lets an unauthenticated attacker log in as administrator and execute arbitrary code.
The record
- CVE
- CVE-2026-2635
- Published
- Feb 20, 2026
- Updated
- Feb 20, 2026
- Vendor
- MLflow Project
- Product
- MLflow
- Classifications
- CWE-798, CWE-1393, T1078.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 20, 2026CVE publishedPublication date reported by the CVE source.
- Feb 20, 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=3.4.0
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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