CVE-2026-11422 | Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28… | CVSS 7.1 HIGH

Description

Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28 contains a code injection vulnerability in the WaveDrom rendering pipeline that allows attackers to execute arbitrary JavaScript by embedding malicious content in a wavedrom fenced code block within a crafted Markdown document. Attackers can exploit the unsanitized passing of wavedrom block content to window.eval() in the VS Code webview context to abuse the extension's message passing and invoke arbitrary file writes on the local filesystem.

Metadata

CVE ID: CVE-2026-11422
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-05 20:01 UTC
Published: 2026-06-05 20:16 UTC
Last updated: 2026-06-08 13:09 UTC
Primary CWE: CWE-95
CWE-95 Improper Neutralization of Directives in Dynamically …
Vendor / Product: shd101wyy / Markdown Preview Enhanced
Sources: cve.org · NVD

Severity & Metrics

7.1 HIGH CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: total

Affected products (2)

Vendor	Product	Platform	Versions
shd101wyy	crossnote	—	0 < 0.9.28
shd101wyy	Markdown Preview Enhanced	—	0 < 0.8.27

Weakness (CWE)

CWE	Source	Description
CWE-95	cna	CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.4	HIGH	4.0	cna	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
7.1	HIGH	3.1	cna	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References (4)