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CVE-2021-21610
Good to know:
Date: January 13, 2021
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.
Language: Java
Severity Score
Severity Score
Weakness Type (CWE)
Cross-Site Scripting (XSS)
CWE-79Top Fix
Upgrade Version
Upgrade to version org.jenkins-ci.main:jenkins-core:2.275, org.jenkins-ci.main:jenkins-core:LTS 2.263.2
CVSS v3
Base Score: |
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Attack Vector (AV): | |
Attack Complexity (AC): | |
Privileges Required (PR): | |
User Interaction (UI): | |
Scope (S): | |
Confidentiality (C): | NONE |
Integrity (I): | NONE |
Availability (A): | PARTIAL |
CVSS v2
Base Score: |
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Access Vector (AV): | |
Access Complexity (AC): | |
Authentication (AU): | |
Confidentiality (C): | HIGH |
Integrity (I): | HIGH |
Availability (A): | HIGH |
Additional information: |