https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 23:10:26 +0000 https://vulnerability.circl.lu/vuln/cve-2026-5388 <p><strong>Affected:</strong> EmilStenstrom justhtml</p> <p>justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers (clean_url_value/clean_url_in_js_string), HTML serialization, Markdown passthrough (html_passthrough=True), and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass sanitization to inject active HTML and JavaScript — for example via encoded javascript: URLs, backslash-based relative URLs resolved as remote hosts, markup-breaking programmatic element/attribute names or HTML comments, raw &lt;/textarea&gt; reintroduction through Markdown passthrough, or preserved &lt;style&gt;/&lt;meta http-equiv=refresh&gt;/&lt;base href&gt; tags in custom policies. Most custom-policy issues do not affect the default sanitize=True configuration; they primarily affect helper APIs, programmatic DOM construction, html_passthrough=True, and custom policies/transform pipelines.</p> <p><strong>Affected:</strong> EmilStenstrom justhtml</p> <p>justhtml before 1.15.0 contains multiple security issues in URL sanitization helpers (clean_url_value/clean_url_in_js_string), HTML serialization, Markdown passthrough (html_passthrough=True), and several custom sanitization-policy edge cases. Depending on configuration, an attacker can bypass sanitization to inject active HTML and JavaScript — for example via encoded javascript: URLs, backslash-based relative URLs resolved as remote hosts, markup-breaking programmatic element/attribute names or HTML comments, raw &lt;/textarea&gt; reintroduction through Markdown passthrough, or preserved &lt;style&gt;/&lt;meta http-equiv=refresh&gt;/&lt;base href&gt; tags in custom policies. Most custom-policy issues do not affect the default sanitize=True configuration; they primarily affect helper APIs, programmatic DOM construction, html_passthrough=True, and custom policies/transform pipelines.</p> https://vulnerability.circl.lu/vuln/cve-2026-5388