CVE-2026-86644
star7th showdoc API Page Save Endpoint editormd.js cross site scripting
- State
- Published
- Severity
- 5.1 Medium
- Published
- Sep 8, 2026
- Updated
- Sep 8, 2026
- Reserved
- Sep 8, 2026
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."
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 3.5 Low | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C | VulDB |
| 3.0 | 3.5 Low | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C | VulDB |
| 2.0 | 4.0 Medium | AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:OF/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
showdocstar7th |
|
References
- VDB-399755 | star7th showdoc API Page Save Endpoint editormd.js cross site scriptingvdb-entry
- VDB-399755 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- CVE-2026-86644 | CVE Analysis and Reportthird-party-advisory
- Submit #906282 | star7th ShowDoc 3.7.1 - 3.9.1 Cross Site Scriptingthird-party-advisory
- https://gist.github.com/saDL0w/36a72a076e9ab24408a3d27582e778b2exploit
- https://github.com/star7th/showdoc/commit/a8ea1520850b4242f395247f72e87e597506cef0patch
- https://github.com/star7th/showdoc/releases/tag/v3.9.2patch
- https://github.com/star7th/showdoc/product
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.