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CVE-2021-21603 is an improper output-escaping vulnerability in Jenkins notification-bar response handling. Jenkins 2.274 and earlier, and Jenkins LTS 2.263.1 and earlier, render notification-bar response contents without appropriate escaping, allowing attacker-controlled markup or script to be interpreted in a victim's browser.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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 Jenkins cross-site scripting vulnerability in the notification bar.
A cross-site scripting vulnerability in the Jenkins notification bar.
An important-severity Jenkins cross-site scripting vulnerability in notification-bar responses caused by improper output escaping. Exploitation requires network access, low privileges, and user interaction; it can 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.