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CVE-2020-13959 is a reflected cross-site scripting vulnerability in Apache Velocity Tools prior to 3.1. The issue is in VelocityView error-page handling, where the default error page reflects the vm/template file value derived from the request URL back to the user without proper escaping or output encoding. When an invalid or non-existent template path is requested, the "template not found" response can include attacker-controlled content from the URL. By supplying a crafted URL containing a JavaScript payload in the vm file/path component and inducing a victim to visit it, an attacker can cause arbitrary script execution in the security context of the vulnerable site.
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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 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.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.