A data modification vulnerability exists in Jenkins Blue Ocean Plugins 1.10.1 and earlier in blueocean-core-js/src/js/bundleStartup.js blueocean-core-js/src/js/fetch.ts blueocean-core-js/src/js/i18n/i18n.js blueocean-core-js/src/js/urlconfig.js blueocean-rest/src/main/java/io/jenkins/blueocean/rest/APICrumbExclusion.java blueocean-web/src/main/java/io/jenkins/blueocean/BlueOceanUI.java blueocean-web/src/main/resources/io/jenkins/blueocean/BlueOceanUI/index.jelly that allows attackers to bypass all cross-site request forgery protection in Blue Ocean API.