User Interface Vulnerability in SillyTavern by SillyTavern Inc.
CVE-2026-44649

9.8CRITICAL

Key Information:

Vendor

Sillytavern

Status
Sillytavern
Vendor
CVE Published:
29 May 2026

What is CVE-2026-44649?

SillyTavern, a user-friendly interface for interacting with AI models, has a security flaw that allows any network client to authenticate as any user, including administrators, through malicious manipulation of HTTP headers. This occurs when configurations for Single Sign-On (SSO) with Authelia or Authentik are enabled without proper validation of the incoming headers, leaving the system open to unauthorized access. The vulnerability has been addressed in version 1.18.0.

Affected Version(s)

SillyTavern < 1.18.0

References

https://github.com/SillyTavern/SillyTavern/security/advis...
x_refsource_CONFIRM

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.