CVE-2026-38949 Cross-site scripting in n/a
Attackers can inject arbitrary code via the image content creation endpoint in HTMLy, potentially executing scripts in user browsers.
- 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-2026-38949?
CVE-2026-38949 is a high-severity cross-site scripting vulnerability in n/a, published on 28 Apr 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
Cross-Site Scripting (XSS) vulnerability exists in HTMLy version 3.1.1 in the content creation functionality at the /add/content?type=image endpoint. The application fails to properly sanitize user input, allowing injection of arbitrary code
Weakness: CWE-79
Which versions are affected by CVE-2026-38949?
How do I fix CVE-2026-38949?
No fix has been published for CVE-2026-38949 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-2026-38949 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-38949 exists.
Sources
Also known as GHSA-42cc-qc2r-r9fj.