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CVE-2026-84677 is a stored cross-site scripting vulnerability in Jenkins update-center2 3.18.3 and earlier. Plugin-supplied names, descriptions, and version metadata are rendered in plugin download-index pages without appropriate escaping. A plugin hosting provider can persist attacker-controlled script in this metadata, which executes when a victim views the affected download-index page.
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No public exploit code observed for this vulnerability.
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A stored cross-site scripting vulnerability in Jenkins update-center2 versions 3.18.3 and earlier. Plugin-controlled names, descriptions, and version metadata are insufficiently escaped on plugin download index pages; an attacker able to host a plugin can inject script content.
A Jenkins plugin vulnerability referenced by the 2026-09-02 Jenkins security advisory; technical details are not provided.
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.