CVE-2026-44649: SillyTavern is a locally installed user interface that allows users to interact with text generation large language mode

SillyTavern, a locally installed interface for interacting with AI language models and image generators, had a vulnerability in versions before 1.18.0 where it trusted HTTP headers (Remote-User and X-Authentik-Username) used by single sign-on systems without verifying they came from a trusted source. This meant anyone who could connect directly to SillyTavern could fake these headers to log in as any user, including administrators, without a password, but only if SSO was explicitly enabled in the configuration.