' terminates the class attribute early and the markup that follows is emitted as live HTML.\n\nAn 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.\n\nThe 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.\n\nThis issue affects mdex from 0.11.3 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.", "isPartOf": { "@id": "https://www.cvefind.com/ja/cve/CVE-2026-53427.html#webpage" }, "publisher": { "@id": "https://www.cvefind.com/#organization" }, "@id": "https://www.cvefind.com/ja/cve/CVE-2026-53427.html#techarticle" } ] }
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CVE-2026-53427 : 詳細

CVE-2026-53427

2026-06-29
19h16 +00:00
Cross-site Scripting
A03-Injection
2026-10-25
21h10 +00:00
CVE.org
NVD
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CVE の説明

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
. A single-quoted shell token preserves an inner double quote through shlex parsing, so a value such as '">' 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.

CVE の情報

関連する弱点

CWE-ID 弱点名 出典
CWE-79 Improper Neutralization of Input During Web Page Generation
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

参考資料

CVE Findに掲載されている情報は、慎重に選定された複数の参照ソースから取得されています。CVEデータはMITRE Corporationおよび国家脆弱性データベース（NVD）が提供しています。既知の悪用された脆弱性（KEV）カタログはサイバーセキュリティ・インフラセキュリティ庁（CISA）から、EPSSスコアはFIRST.orgから取得しています。また、ソフトウェアの弱点（CWE）および共通攻撃パターン（CAPEC）に関するデータはMITRE Corporationが管理し、ハードウェアおよびソフトウェア構成（CPE）に関する情報はNVDが提供しています。