CVE-2026-86644: star7th showdoc

star7th showdoc API Page Save Endpoint editormd.js cross site scripting

CVSS 5.1 MediumEPSS 0.0037 · 30th percentile

Published by the CVE Program (CNA: VulDB) at 8 Sept 2026, 13:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
star7th	showdoc	affected 3.9.0 affected 3.9.1 unaffected 3.9.2

Identifiers

CVE-2026-86644

CNA

VulDB

Weakness (CWE)

CWE-79 · CWE-94

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.1	Medium	4.0	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	CNA (VulDB)Used for this record
3.5	Low	3.1	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	CNA (VulDB)
3.5	Low	3.0	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	CNA (VulDB)
4.0	Medium	2.0	AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:OF/RC:C	CNA (VulDB)

CISA KEV Not listed.
EPSS 0.0037, the 30th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 8 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

vuldb.com/vuln/399755 vdb-entry
vuldb.com/vuln/399755/cti signaturepermissions-required
vuldb.com/cve/CVE-2026-86644 third-party-advisory
vuldb.com/submit/906282 third-party-advisory
github.com/star7th/showdoc/commit/a8ea1520850b4242f395247f72e87e597506cef0 patch
github.com/star7th/showdoc/releases/tag/v3.9.2 patch
github.com/star7th/showdoc/ product
gist.github.com/saDL0w/36a72a076e9ab24408a3d27582e778b2 exploit

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.