CVE-2023-43496

Severity: high (CVSS 8.8 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-276

Description

Jenkins 2.423 and earlier, LTS 2.414.1 and earlier creates a temporary file in the system temporary directory with the default permissions for newly created files when installing a plugin from a URL, potentially allowing attackers with access to the system temporary directory to replace the file before it is installed in Jenkins, potentially resulting in arbitrary code execution.

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-3072
http://www.openwall.com/lists/oss-security/2023/09/20/5
https://www.jenkins.io/security/advisory/2023-09-20/#SECURITY-3072

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