CVE-2026-79320 Cross-site scripting in n/a
Attacker can execute arbitrary scripts in the application origin via DOM-based XSS in Stencil core when experimental slot fixes are enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-79320?
CVE-2026-79320 is a medium-severity cross-site scripting vulnerability in n/a, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Stencil core 4.43.5 contains a DOM-based cross-site scripting (XSS) vulnerability in the component runtime. When a downstream application enables the experimental slot fixes option and uses scoped components, assigning a string to the textContent property of such a component's host element causes the value to be parsed as HTML instead of being inserted as text. If an application writes attacker-controlled data to these host elements, the data can be interpreted as markup and script can execute in the context of the application's origin.
Weakness: CWE-79
Which versions are affected by CVE-2026-79320?
How do I fix CVE-2026-79320?
No fix has been published for CVE-2026-79320 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-2026-79320 being exploited?
There is no known exploitation of CVE-2026-79320 in the wild and no public exploit code.
Sources
Also known as GHSA-pm76-9f64-vwpc.