CVEvulnerability

CVE-2026-44649

9.8 CRITICAL Published 2026-05-29 Modified 2026-07-22 Official page ↗
Status
Deferred
Published
2026-05-29
Last modified
2026-07-22
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-290, CWE-306, CWE-346, CWE-807

Description

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.

Related

Weakness · CWE (4)

  • CWE-290 Authentication Bypass by Spoofing weakness
  • CWE-306 Missing Authentication for Critical Functionality weakness
  • CWE-346 Origin Validation Error weakness
  • CWE-807 Reliance on Untrusted Inputs in a Security Decision weakness

References