Description
A vulnerability was determined in star7th showdoc up to 3.9.1. This vulnerability affects unknown code of the file web_src/public/editor.md/editormd.js of the component API Page Save Endpoint. Executing a manipulation can lead to cross site scripting. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 3.9.2 is able to resolve this issue. This patch is called a8ea1520850b4242f395247f72e87e597506cef0. Upgrading the affected component is recommended. The vendor confirms: "The fix [...] sets Mermaid `securityLevel` to `strict`, disables `htmlLabels`, and sanitizes rendered SVG with DOMPurify."
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| star7th | showdoc | 3.9.0, 3.9.1 | 3.9.2 |
References
- VDB-399755 | star7th showdoc API Page Save Endpoint editormd.js cross site scripting vdb-entry
- VDB-399755 | CTI Indicators (IOB, IOC, TTP, IOA) signature permissions-required
- CVE-2026-86644 | CVE Analysis and Report third-party-advisory
- Submit #906282 | star7th ShowDoc 3.7.1 - 3.9.1 Cross Site Scripting third-party-advisory
- https://gist.github.com/saDL0w/36a72a076e9ab24408a3d27582e778b2 exploit
- https://github.com/star7th/showdoc/commit/a8ea1520850b4242f395247f72e87e597506cef0 patch
- https://github.com/star7th/showdoc/releases/tag/v3.9.2 patch
- https://github.com/star7th/showdoc/ product