What’s Vulnerable › Vulnerabilities

CVE-2026-86644: star7th showdoc API Page Save Endpoint editormd.js cross site scripting

• Severity: low (CVSS 3.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-08 · updated 2026-09-08
• Weakness: CWE-79

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

• star7th/showdoc: 3.9.0, 3.9.1

References

• https://gist.github.com/saDL0w/36a72a076e9ab24408a3d27582e778b2
• https://github.com/star7th/showdoc/
• https://github.com/star7th/showdoc/commit/a8ea1520850b4242f395247f72e87e597506cef0
• https://github.com/star7th/showdoc/releases/tag/v3.9.2
• https://vuldb.com/cve/CVE-2026-86644
• https://vuldb.com/submit/906282
• https://vuldb.com/vuln/399755
• https://vuldb.com/vuln/399755/cti

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