Arbitrary file read vulnerability through the Jenkins CLI can lead to RCE

Exploitation

Confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.

CVSS 4.0

9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A · score source

EPSS

• CVE-2024-23897: 100.00% estimated exploitation activity in the next 30 days; percentile 100.00 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Jenkins has a built-in command line interface (CLI) to access Jenkins from a script or shell environment. Jenkins uses the args4j library to parse command arguments and options on the Jenkins controller when processing CLI commands. This command parser has a feature that replaces an @ character followed by a file path in an argument with the file’s contents (expandAtFiles). This feature is enabled by default and Jenkins 2.441 and earlier, LTS 2.426.2 and earlier does not disable it. This allows attackers to read arbitrary files on the Jenkins controller file system using the default character encoding of the Jenkins controller process. Attackers with Overall/Read permission can read entire files. Attackers without Overall/Read permission can read the first few lines of files. The number of lines that can be read depends on available CLI commands. As of publication of this advisory, the Jenkins security team has found ways to read the first three lines of files in recent releases of…

Published by the source

24 Jan 2024, 18:31 UTC

Last modified by the source

22 Oct 2025, 19:24 UTC

Source last checked

26 Oct 2026, 16:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-6f9g-cxwr-q5jr

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# Patch Next advisory brief: CVE-2024-23897

Advisory: Arbitrary file read vulnerability through the Jenkins CLI can lead to RCE
IDs: CVE-2024-23897, GHSA-6f9g-cxwr-q5jr
Record: https://patchnext.com/advisories/cve-2024-23897 (revision 1, source checked 26 Oct 2026, 16:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
Vendor response: Vendor fix available; fixed versions by package: org.jenkins-ci.main:jenkins-core 2.442, 2.440.1, 2.426.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.jenkins-ci.main:jenkins-core: affected >= 1.606, <= 2.426.2; >= 2.441, <= 2.441; >= 2.427, < 2.440.1; fixed in 2.426.3, 2.442, 2.440.1

## Suggested inspection (read-only)
- Maven org.jenkins-ci.main:jenkins-core: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.jenkins-ci.main:jenkins-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CISA added CVE-2024-23897 to the Known Exploited Vulnerabilities catalog on 2024-08-19.)
- Verified: https://github.com/advisories/GHSA-6f9g-cxwr-q5jr (GitHub-reviewed advisory GHSA-6f9g-cxwr-q5jr lists affected ranges: Maven org.jenkins-ci.main:jenkins-core >=1.606 =2.441 =2.427 <2.440.1)

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