CVE-2026-44649: SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and…

PriorityP260critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

0.22%

12.1th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
sillytavern	sillytavern	< 1.18.0	1.18.0
sillytavern	sillytavern	>= 0 < 1.18.0	1.18.0

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