| Title | kagisearch smallweb main Cross Site Scripting |
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| Description | A reflected Cross-Site Scripting (XSS) vulnerability was discovered in the kagisearch/smallweb web application. The index() route handler at app/sw.py line 1395 captures the raw HTTP query string via request.query_string.decode() and passes it unsanitized to the Jinja2 template context as the qs variable. Four template partials (reactions.html, flag_panel.html, mobile_more.html) then render this variable using the Jinja2 |safe filter in HTML form action attributes, which explicitly disables HTML auto-escaping. An attacker who sends a raw HTTP request with unencoded double-quote characters and a script tag in the query string can break out of the form action attribute and inject arbitrary JavaScript code that executes in the victim's browser within the kagi.com origin.
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| Source | ⚠️ https://github.com/kagisearch/smallweb/issues/854 |
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| User | Customeres (UID 86596) |
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| Submission | 08/03/2026 07:15 (1 month ago) |
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| Moderation | 09/12/2026 19:36 (1 month later) |
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| Status | Accepted |
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| VulDB entry | 403168 [kagisearch smallweb up to 0ecb9c48edbf98dc7e934b54fbac43869e64b4cf Query String Rendering app/sw.py index qs cross site scripting] |
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| Points | 20 |
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