CVE-2026-2635
CVE-2026-2635 is a high-severity vulnerability with a CVSS 3.x base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1393.
Key facts
- Severity: High (CVSS 3.x base score 7.3)
- EPSS exploit prediction: 1% (58th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-7766
- Weakness: CWE-1393
- Published:
- Last modified:
Description
MLflow Use of Default Password Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of MLflow. Authentication is not required to exploit this vulnerability. The specific flaw exists within the basic_auth.ini file. The file contains hard-coded default credentials. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of the administrator. Was ZDI-CAN-28256.
Frequently asked questions
- What is CVE-2026-2635?
- MLflow Use of Default Password Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of MLflow. Authentication is not required to exploit this vulnerability. The specific flaw exists within the basic_auth.ini file. The file contains hard-coded default credentials. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of the administrator. Was ZDI-CAN-28256.
- How severe is CVE-2026-2635?
- CVE-2026-2635 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2026-2635 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-2635?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-2635 have an EU (EUVD) identifier?
- Yes. CVE-2026-2635 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7766.
- When was CVE-2026-2635 published?
- CVE-2026-2635 was published on 2026-02-20 and last updated on 2026-06-30.
References
- https://github.com/mlflow/mlflow/pull/19260
- https://www.zerodayinitiative.com/advisories/ZDI-26-111/
- https://access.redhat.com/security/cve/CVE-2026-2635
- https://bugzilla.redhat.com/show_bug.cgi?id=2441514
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2635.json
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