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CVE-2021-21610 is a reflected cross-site scripting vulnerability in Jenkins 2.274 and earlier and Jenkins LTS 2.263.1 and earlier. Jenkins did not restrict the URL used to render a formatted preview of markup supplied through a query parameter. When the configured markup formatter permits unsafe elements, attacker-controlled markup can execute script in the browser of a user who accesses a crafted preview request.
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No public exploit code observed for this vulnerability.
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6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced by this OpenShift Container Platform security advisory; no further details are provided in the content.
A reflected cross-site scripting vulnerability in the Jenkins markup formatter preview.
A reflected cross-site scripting vulnerability in Jenkins markup-formatter preview functionality.
An important reflected cross-site scripting vulnerability in Jenkins markup-formatter previews. An unauthenticated network attacker can supply malicious markup through a query parameter, but exploitation requires a user to interact with the crafted content. Successful exploitation can compromise confidentiality and integrity in the affected Jenkins web context.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.