CVE-2026-44649

The record

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. Prior to 1.18.0, SillyTavern accepts Remote-User (Authelia) and X-Authentik-Username (Authentik) HTTP headers to automatically log in users when SSO is configured. There is no validation that these headers originate from a trusted reverse proxy. Any network client that can reach the SillyTavern port directly can inject these headers and authenticate as any user, including administrators, without a password. This vulnerability is exploitable only when sso.autheliaAuth: true or sso.authentikAuth: true is set in config.yaml (both default to false). This vulnerability is fixed in 1.18.0.

Affected packages

Related vulnerabilities

• GHSA-gxx6-h3g6-vwjh SillyTavern has Authentication Bypass via SSO Header Injection Same vulnerability
• CVE-2026-44652 SillyTavern is a locally installed user interface that allows users to interact with text… Also affects sillytavern
• CVE-2026-46372 SillyTavern is a locally installed user interface that allows users to interact with text… Also affects sillytavern
• CVE-2026-44650 SillyTavern is a locally installed user interface that allows users to interact with text… Also affects sillytavern
• CVE-2026-44651 SillyTavern is a locally installed user interface that allows users to interact with text… Also affects sillytavern
• CVE-2026-44648 SillyTavern is a locally installed user interface that allows users to interact with text… Also affects sillytavern
• GHSA-qg89-qwwh-5f3j SillyTavern: SSRF in SearXNG Search Proxy via Unvalidated baseUrl Also affects sillytavern
• GHSA-ccfq-2454-f5xw SillyTavern has a SSRF vulnerability in the CORS proxy middleware Also affects sillytavern