Auth bypass in Jenkins
CVE-2023-27903
Jenkins 2.393 and earlier, LTS 2.375.3 and earlier creates a temporary file in the default temporary directory with the default permissions for newly created files when uploading a file parameter through the CLI, potentially allowing attackers with access to the Jenkins controller file system to read and write the file before it is used.
Vulnerability class: Broken Access Control
EPSS: 0.002 (15.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Jenkins
- Jenkins Project — versions 2.394, 2.375.4, 2.387.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- jenkinsci-cert@googlegroups.com (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2023-27903?
- CVE-2023-27903 is a medium-severity vulnerability in Jenkins, classified under Incorrect Authorization. CVSS score: 4.4/10. Published 2023-03-10.
- How severe is CVE-2023-27903?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2023-27903 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.