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BIT-jenkins-2021-21610

Affected: Bitnami: jenkins

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering a formatted preview of markup passed as a query parameter, resulting in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup.

cnvd-2021-04646

EUVD-2026-22296

fkie_cve-2021-21610

GHSA-7qf3-c2q8-69m3 — Reflected XSS vulnerability in Jenkins markup formatter preview

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

Jenkins allows administrators to choose the markup formatter to use for descriptions of jobs, builds, views, etc. displayed in Jenkins. When editing such a description, users can choose to have Jenkins render a formatted preview of the description they entered.

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering the formatted preview of markup passed as a query parameter. This results in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup, like [Anything Goes Formatter Plugin](https://plugins.jenkins.io/anything-goes-formatter/).

Jenkins 2.275, LTS 2.263.2 requires that preview URLs are accessed using POST and sets Content-Security-Policy headers that prevent execution of unsafe elements when the URL is accessed directly.

In case of problems with this change, these protections can be disabled by setting the [Java system properties](https://www.jenkins.io/doc/book/managing/system-properties/) `hudson.markup.MarkupFormatter.previewsAllowGET` to `true` and/or `hudson.markup.MarkupFormatter.previewsSetCSP` to `false`. Doing either is discouraged.

gsd-2021-21610

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