---
id: CVE-2026-44649
title: >-
  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
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 (Auth…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-290
  - CWE-306
  - CWE-346
  - CWE-807
published: '2026-05-29'
updated: '2026-07-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44649'
references:
  - url: >-
      https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-gxx6-h3g6-vwjh
    label: security-advisories@github.com
  - url: >-
      https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-gxx6-h3g6-vwjh
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00295
epssPercentile: 0.19719
ingestedAt: '2026-07-22T20:06:05.315Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.