SillyTavern up to 1.15.x Asset Download Endpoint server-side request forgery

Summaryinfo

A vulnerability has been found in SillyTavern up to 1.15.x and classified as critical. The impacted element is an unknown function of the component Asset Download Endpoint. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-26286. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in SillyTavern up to 1.15.x and classified as critical. Affected by this vulnerability is an unknown part of the component Asset Download Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. In versions prior to 1.16.0, a Server-Side Request Forgery (SSRF) vulnerability in the asset download endpoint allows authenticated users to make arbitrary HTTP requests from the server and read the full response body, enabling access to internal services, cloud metadata, and private network resources. The vulnerability has been patched in the version 1.16.0 by introducing a whitelist domain check for asset download requests. It can be reviewed and customized by editing the `whitelistImportDomains` array in the `config.yaml` file.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-26286 since 02/12/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 1.16.0 eliminates this vulnerability.

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Productinfo

Name

• SillyTavern

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15

Website

• Product: https://github.com/SillyTavern/SillyTavern/

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