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

CVSS 9.8 · Critical EPSS 0.22% · P12

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)
Vulnerability Title
SillyTavern 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SillyTavern是SillyTavern开源的一个大语言模型的前端界面。 SillyTavern 1.18.0之前版本存在安全漏洞，该漏洞源于接受Remote-User和X-Authentik-Username HTTP头自动登录用户，但未验证这些头是否来自受信任的反向代理，导致任何网络客户端可直接注入这些头并作为任何用户进行身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
SillyTavernSillyTavern < 1.18.0 -

II. Public POCs for CVE-2026-44649

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 8013 chars
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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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