CVE-2026-44649: SillyTavern is a locally installed user interface that allows users to interact with text generation…
- Occurred
- May 29, 2026
- Published
- May 29, 2026
- Source
- NVD CVE
Summary
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.
Tags
- CVE
- CVE-2026-44649
- cvss:CRITICAL
Classification
Rationale: Unvalidated HTTP headers allow unauthorized authentication bypass, enabling account takeover and privacy violations.
Classifier: Qwen/Qwen3.5-35B-A3B-FP8