CVE-2026-86644star7th showdoc API Page Save Endpoint editormd.js cross site scripting
Updated under an hour ago ()
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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."
- CVSS
- 3.5 LOW (v3.1, CNA)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
- Weakness (CWE)
- CWE-79, CWE-94
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulDB
- NVD analysis
- Deferred
- Record last updated
- Sep 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
star7th showdoc showdoc:showdoc | 3.9.0; 3.9.1; 3.9.2 not affected | CNA record |
References
- https://vuldb.com/vuln/399755vdb-entry
- https://vuldb.com/vuln/399755/ctisignature, permissions-required
- https://vuldb.com/cve/CVE-2026-86644third-party-advisory
- https://vuldb.com/submit/906282third-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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.