https://db.gcve.eu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 06 Oct 2026 22:19:25 +0000 https://db.gcve.eu/vuln/fkie_cve-2026-54889 <p>Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in leandrocp mdex allows cross-site scripting via unsanitized URL schemes in Quill Delta output.</p> <p>&#39;Elixir.MDEx&#39;:to_delta/2 converts Markdown into a Quill Delta. &#39;Elixir.MDEx.DeltaConverter&#39;:default_convert_node/3 in lib/mdex/delta_converter.ex copies the URL of a link, wikilink, or image node directly from the parsed Markdown into the Delta &#34;link&#34; or &#34;image&#34; attribute without applying a scheme allowlist or any normalization.</p> <p>An attacker who controls the Markdown text can supply a javascript: URL (for example [click](javascript:alert(document.cookie))) that survives verbatim into the Delta attribute. When the Delta is rendered to HTML by a downstream renderer (such as quill-delta-to-html or the Quill client), the attribute becomes an &lt;a href&gt; or &lt;img src&gt;, and the javascript: scheme executes in the browser of anyone who views the rendered content. The link and wikilink cases are the strongest vectors because javascript: in an href executes on click; the image case is lower impact because javascript: in &lt;img src&gt; generally does not execute in modern browsers.</p> <p>This issue affects mdex: from 0.8.3 before 0.13.2.</p> <p>Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in leandrocp mdex allows cross-site scripting via unsanitized URL schemes in Quill Delta output.</p> <p>&#39;Elixir.MDEx&#39;:to_delta/2 converts Markdown into a Quill Delta. &#39;Elixir.MDEx.DeltaConverter&#39;:default_convert_node/3 in lib/mdex/delta_converter.ex copies the URL of a link, wikilink, or image node directly from the parsed Markdown into the Delta &#34;link&#34; or &#34;image&#34; attribute without applying a scheme allowlist or any normalization.</p> <p>An attacker who controls the Markdown text can supply a javascript: URL (for example [click](javascript:alert(document.cookie))) that survives verbatim into the Delta attribute. When the Delta is rendered to HTML by a downstream renderer (such as quill-delta-to-html or the Quill client), the attribute becomes an &lt;a href&gt; or &lt;img src&gt;, and the javascript: scheme executes in the browser of anyone who views the rendered content. The link and wikilink cases are the strongest vectors because javascript: in an href executes on click; the image case is lower impact because javascript: in &lt;img src&gt; generally does not execute in modern browsers.</p> <p>This issue affects mdex: from 0.8.3 before 0.13.2.</p> https://db.gcve.eu/vuln/fkie_cve-2026-54889