Apache Tomcat 4.0.3 contains a reflected cross-site scripting vulnerability in error handling for requests using the /servlet/ mapping. When a crafted invoker-servlet URL causes a servlet exception, Tomcat reflects malformed request data in the resulting error response without properly filtering script content. An attacker can cause script to execute in the browser of another user viewing the response.
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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.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Cross-site scripting through unescaped exception content in invoker servlet handling.
Cross-site scripting vulnerability through unescaped malformed-request data in exception output.
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.