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BIT-jenkins-2021-21615

Affected: Bitnami: jenkins

Jenkins LTS 2.263.2 allows reading arbitrary files using the file browser for workspaces and archived artifacts due to a time-of-check to time-of-use (TOCTOU) race condition.

cnvd-2021-13672

EUVD-2026-22309

fkie_cve-2021-21615

Jenkins 2.275 and LTS 2.263.2 allows reading arbitrary files using the file browser for workspaces and archived artifacts due to a time-of-check to time-of-use (TOCTOU) race condition.

GHSA-qxp6-27gw-99cj — Time-of-check Time-of-use (TOCTOU) Race Condition in Jenkins

Affected: Maven: org.jenkins-ci.main:jenkins-core

Due to a time-of-check to time-of-use (TOCTOU) race condition, the file browser for workspaces, archived artifacts, and `$JENKINS_HOME/userContent/` follows symbolic links to locations outside the directory being browsed in Jenkins 2.275 and LTS 2.263.2.

This allows attackers with Job/Workspace permission and the ability to control workspace contents, e.g., with Job/Configure permission or the ability to change SCM contents, to create symbolic links that allow them to access files outside workspaces using the workspace browser.

This issue is caused by an incorrectly applied fix for SECURITY-1452 / CVE-2021-21602 in the [2021-01-13 security advisory](https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-1452).

Jenkins 2.276, LTS 2.263.3 no longer differentiates the check and the use of symlinks in workspace browsers.

gsd-2021-21615

RHSA-2021:0423 — Red Hat Security Advisory: OpenShift Container Platform 4.6.17 security and packages update

ant: insecure temporary file vulnerability ant: insecure temporary file jenkins: Arbitrary file read vulnerability in workspace browsers jenkins: XSS vulnerability in notification bar jenkins: Improper handling of REST API XML deserialization errors jenkins: Path traversal vulnerability in agent names jenkins: Arbitrary file existence check in file fingerprints jenkins: Excessive memory allocation in graph URLs leads to denial of service jenkins: Stored XSS vulnerability in button labels jenkins: Missing permission check for paths with specific prefix jenkins: Reflected XSS vulnerability in markup formatter preview jenkins: Stored XSS vulnerability on new item page jenkins: Filesystem traversal by privileged users