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

Quick assessment

Affected
lepture mistune
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mistune 3.3.0 之前的版本在 Include 指令中存在跨站脚本（XSS）漏洞：该指令会将包含的 、 或 文件内容以原始 令牌形式输出。若攻击者能够部署一个可被渲染器读取的 HTML 文件，便可结合路径遍历技术，通过 Include 指令引用该文件；当 时，即可在页面中执行存储型脚本。

CVSS 6.1 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
lepture mistune < 3.3.0 affected
3.3.0 unaffected
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I. Basic Information for CVE-2026-115350

Vulnerability Information
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Vulnerability Title
Mistune before 3.3.0 Stored XSS via Include Directive HTML Files
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lepture mistune 0 ~ 3.3.0 -

II. Public POCs for CVE-2026-115350

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III. Intelligence Information for CVE-2026-115350

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Vendor Advisories for CVE-2026-115350 (2)

Same Patch Batch · lepture · 2026-10-22 · 9 CVEs total

CVE-2026-115353 8.6 HIGH Mistune before 3.3.0 Path Traversal via include Directive
CVE-2026-115349 7.5 HIGH Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing
CVE-2026-115352 7.5 HIGH Mistune before 3.3.0 Quadratic-Time DoS via Unmatched Brackets in Inline Parser
CVE-2026-115348 7.5 HIGH Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text
CVE-2026-115347 7.5 HIGH Mistune before 3.3.0 Quadratic Denial of Service via parse_link_text
CVE-2026-115355 7.5 HIGH Mistune before 3.3.0 Path Traversal and XSS via Include Directive
CVE-2026-115354 6.5 MEDIUM Mistune before 3.3.0 Arbitrary Local File Read via Include Directive
CVE-2026-115351 4.7 MEDIUM Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option

IV. Related Vulnerabilities

Same product: mistune
Same vendor: lepture
Same weakness: CWE-79

V. Comments for CVE-2026-115350

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