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CVE-2026-44649

SillyTavern: Authentication Bypass via SSO Header Injection PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
SillyTavern / SillyTavernaffected < 1.18.0

CWE

CWE-290, CWE-306, CWE-346, CWE-807

References

ADP enrichment

CISA-ADP

No English description supplied.