stenciljs Core 4.43.5 Runtime cross site scripting

Summaryinfo

A vulnerability was found in stenciljs Core 4.43.5. It has been classified as problematic. This affects an unknown part of the component Runtime. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-79320. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in stenciljs Core 4.43.5 and classified as problematic. This issue affects an unknown code block of the component Runtime. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-79320 since 08/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• stenciljs

Name

• Core

Version

• 4.43.5

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CPE 2.2info

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