Description
In Jenkins 2.196 and earlier, LTS 2.176.3 and earlier, the f:expandableTextBox form control interpreted its content as HTML when expanded, resulting in a stored XSS vulnerability exploitable by users with permission to define its contents (typically Job/Configure).
Remediation
References
http://www.openwall.com/lists/oss-security/2019/09/25/3
https://jenkins.io/security/advisory/2019-09-25/#SECURITY-1498
Related Vulnerabilities
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CVE-2020-2297 Vulnerability in maven package com.hoiio.jenkins:sms
CVE-2020-15366 Vulnerability in maven package org.webjars.bower:ajv
CVE-2019-10429 Vulnerability in maven package org.jenkins-ci.plugins:gitlab-logo