CVE-2026-86644
LowCVSS 3.5Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
A vulnerability in star7th showdoc up to 3.9.1 affects unknown code in the file web_src/public/editor.md/editormd.js of the API Page Save Endpoint. Manipulation can lead to cross-site scripting. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 3.9.2 resolves the issue. The patch sets Mermaid 'securityLevel' to 'strict', disables 'htmlLabels', and sanitizes rendered SVG with DOMPurify.
Risk Assessment
An attacker can exploit XSS to execute scripts in the victim's browser, potentially leading to session theft, data theft, or account takeover. Since the exploit is public, the risk is elevated.
Recommendation
Update showdoc to version 3.9.2 or later immediately. Also, restrict API access and monitor logs for suspicious requests.
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Original NVD description (English source)
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."
Vulnerability data from NVD (NIST) · CISA KEV · EPSS