Medium 6.1Published Oct 22, 2026

CVE-2026-115350Mistune before 3.3.0 Stored XSS via Include Directive HTML Files

Updated under an hour ago (Oct 28, 2026, 10:40 AM ET)

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It affects lepture mistune. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for lepture mistune

Exploited in the last 30 days

Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits included .html, .xhtml, or .htm file content as raw block_html tokens. Attackers who can plant an HTML file readable by the renderer can reference it via an include directive, combined with path traversal, to execute stored scripts when escape=False is set.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 22, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

lepture mistune lepture:mistune (from the name)	before 3.3.0; 3.3.0 not affected	CNA record

References

References

https://github.com/lepture/mistune/security/advisories/GHSA-96vr-jm8v-g22j	vendor-advisory
https://www.vulncheck.com/advisories/mistune-before-3.3.0-stored-xss-via-include-directive-html-files	third-party-advisory

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.