CVE-2026-53427— leandrocp MDExNative 跨站脚本漏洞

Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in leandrocp MDEx allows stored or reflected cross-site scripting via attacker-controlled Markdown. When syntax highlighting and full info-string forwarding (render: [full_info_string: true]) are enabled, the Lumis adapter copies the value of a code fence's highlight_lines_class info-string attribute, unescaped, into the class attribute of every rendered line. comrak_nif::lumis_adapter::LumisAdapter::parse_custom_attributes in native/comrak_nif/src/lumis_adapter.rs shlex-parses the info string and stores each key=value pair verbatim, highlight_lines_config pulls highlight_lines_class into the per-line class value, and write_highlighted interpolates that value directly into the class attribute of the per-line <div>. A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as '"><script>alert(1)</script>' terminates the class attribute early and the markup that follows is emitted as live HTML. An attacker who can submit Markdown (through comments, posts, wiki pages, documentation, or any user-generated content) can inject arbitrary HTML and JavaScript that runs in the browser of every user who views the rendered output, enabling session theft, account takeover, and other client-side attacks. No authentication or special privileges are required. The vulnerable native code originally shipped inside mdex (in native/comrak_nif/src/lumis_adapter.rs) and was later extracted into the separate mdex_native package (native/mdex_native_nif/src/lumis_adapter.rs), where it remains unpatched. This issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.

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在Web页面生成时对输入的转义处理不恰当(跨站脚本)

leandrocp MDExNative 跨站脚本漏洞

Leandro Pereira MDExNative是加拿大Leandro Pereira个人开发者开源的一个服务器支撑系统。 leandrocp MDExNative 0.1.0版本至0.2.3之前版本存在跨站脚本漏洞，该漏洞源于输入中和不当，当启用语法高亮和完整信息字符串转发时，Lumis适配器将未转义的highlight_lines_class属性值复制到每个渲染行的class属性中，导致攻击者可通过控制Markdown进行存储型或反射型跨站脚本攻击，注入任意HTML和JavaScript，实现会话

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