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Date: Fri, 5 Apr 2019 11:45:01 +0200
From: Hanno Böck <>
Subject: XSS in roundup bug tracker 404 page


I recently discovered that the python bug tracker had a trivial
reflected Cross Site Scripting vulnerability on the 404 error page.

It essentially just reflected the URL path, so anything like
http://hostname/<img src=x onerror=alert(1)>
(properly URL-encoded, but browsers do this automatically)
would result in XSS.

The software python is using here is the Roundup issue tracker, it's
been reported there as well [2] and fixed in their repo (but no release


Hanno Böck

GPG: FE73757FA60E4E21B937579FA5880072BBB51E42

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