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CVE-2026-44649— SillyTavern: Authentication Bypass via SSO Header Injection

CVSS 9.8 · Critical

Affected Version Matrix 1

VendorProductVersion RangeStatus
SillyTavernSillyTavern< 1.18.0affected
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I. Basic Information for CVE-2026-44649

Vulnerability Information
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Vulnerability Title
SillyTavern: Authentication Bypass via SSO Header Injection
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用欺骗进行的认证绕过
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
SillyTavernSillyTavern < 1.18.0 -

II. Public POCs for CVE-2026-44649

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III. Intelligence Information for CVE-2026-44649

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Vendor Advisories for CVE-2026-44649 (1)

Same Patch Batch · SillyTavern · 2026-05-29 · 6 CVEs total

CVE-2026-446509.1 CRITICALSillyTavern: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'
CVE-2026-463728.5 HIGHSillyTavern: SSRF in SearXNG Search Proxy via Unvalidated baseUrl
CVE-2026-446487.5 HIGHSillyTavern: Existing sessions are not invalidated after password change, allowing session
CVE-2026-44651SillyTavern: Reflected XSS vulnerability in the CORS proxy middleware
CVE-2026-44652SillyTavern: SSRF vulnerability in the CORS proxy middleware

IV. Related Vulnerabilities

Same product: SillyTavern
Same vendor: SillyTavern
Same weakness: CWE-290

V. Comments for CVE-2026-44649

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