CVE-2023-43498

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-20 · updated 2026-06-17
Weakness: CWE-377

Description

In Jenkins 2.423 and earlier, LTS 2.414.1 and earlier, processing file uploads using MultipartFormDataParser creates temporary files in the default system temporary directory with the default permissions for newly created files, potentially allowing attackers with access to the Jenkins controller file system to read and write the files before they are used.

Affected products

Jenkins: before 2.414.2; before 2.424 — fixed in 2.414.2, 2.424

How to fix

Upgrade to a fixed version: Jenkins 2.414.2, 2.424. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2023/09/20/5
https://www.jenkins.io/security/advisory/2023-09-20/#SECURITY-3073
http://www.openwall.com/lists/oss-security/2023/09/20/5
https://www.jenkins.io/security/advisory/2023-09-20/#SECURITY-3073

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