CVE-2026-44649
CVE-2026-44649 · SillyTavern: Authentication Bypass via SSO Header Injection
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 9.8 · Critical · EPSS 0.2% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
sillytavern
- Versions
- < 1.18.0: Affected
No fix published
sillytavern npm
- Affected ranges
- SEMVER: < 1.18.0
Update to 1.18.0