What’s Vulnerable › Vulnerabilities

CVE-2026-86016: VNote: Stored XSS via YAML Frontmatter Leading to Local File Read and Remote Exfiltration

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-29
• Weakness: CWE-79

Description

VNote is a note-taking platform. Prior to 4.3.0, VNote uses the assignment `preNode.innerHTML = p_metaData` in src/data/extra/web/js/markdownit.js to insert YAML frontmatter metadata into a pre element before the protectFromXss sanitization path runs. Opening an attacker-supplied Markdown note can therefore execute stored JavaScript in the file:// viewer context. Because QWebEngineSettings::LocalContentCanAccessRemoteUrls enables local content to access remote URLs, the script can read reachable local note files and transmit their contents to a remote server without further interaction after the note is opened. This issue is fixed in version 4.3.0.

Affected products

• vnotex vnote: before 4.3.0

References

• https://github.com/vnotex/vnote/commit/7371efde531312eb24beb982fb5fdd73469cb171
• https://github.com/vnotex/vnote/releases/tag/v4.3.0
• https://github.com/vnotex/vnote/security/advisories/GHSA-vfhj-c636-h59x
• https://github.com/vnotex/vnote/security/advisories/GHSA-vfhj-c636-h59x

Get alerted when CVE-2026-86016 or the next vulnerability affects your stack