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

Quick assessment

Affected
SillyTavern SillyTavern
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 9.8 · Critical EPSS 0.22% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
SillyTavern SillyTavern < 1.18.0 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
SillyTavern SillyTavern < 1.18.0 -

II. Public POCs for CVE-2026-44649

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8013 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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Full executable POC code
Exploit chain & mitigation
POC zip download
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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-2026-44650 9.1 CRITICAL SillyTavern: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'
CVE-2026-46372 8.5 HIGH SillyTavern: SSRF in SearXNG Search Proxy via Unvalidated baseUrl
CVE-2026-44648 7.5 HIGH SillyTavern: Existing sessions are not invalidated after password change, allowing session
CVE-2026-44651 SillyTavern: Reflected XSS vulnerability in the CORS proxy middleware
CVE-2026-44652 SillyTavern: 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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