CVE-2026-15505 vnotex vnote YAML Frontmatter markdownit.js cross site scripting
Remote attackers can execute arbitrary scripts via YAML frontmatter in vnote, potentially compromising user sessions or data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-15505?
CVE-2026-15505 is a medium-severity cross-site scripting vulnerability in vnotex vnote, published on 12 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A weakness has been identified in vnotex vnote up to 3.20.1. Impacted is an unknown function of the file /src/data/extra/web/js/markdownit.js of the component YAML Frontmatter. This manipulation of the argument p_metaData causes cross site scripting. The attack may be initiated remotely. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-15505?
How do I fix CVE-2026-15505?
No fix has been published for CVE-2026-15505 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-15505 being exploited?
There is no known exploitation of CVE-2026-15505 in the wild and no public exploit code.
Sources
Also known as GHSA-q2vg-w96j-jgp7.