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CVE-2021-21608 is a stored cross-site scripting vulnerability in the Jenkins user interface. Jenkins 2.274 and earlier and Jenkins LTS 2.263.1 and earlier fail to HTML-escape button-label content before rendering it. An attacker able to control a button label can inject script that executes when another user views or interacts with the affected UI.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
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 stored cross-site scripting vulnerability in Jenkins button labels.
A stored cross-site scripting vulnerability in Jenkins button labels.
A stored cross-site scripting vulnerability in Jenkins caused by improper escaping of button labels. An attacker with low privileges can inject attacker-controlled labels; successful exploitation requires user interaction and may affect confidentiality and integrity.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.