SillyTavern has Authentication Bypass via SSO Header Injection

Description

SillyTavern 1.18.0 now includes a configuration option to limit which IP addresses can authorize using SSO headers, limiting to just loopback addresses by default. A setting can be customized according to user’s needs.

Documentation: https://docs.sillytavern.app/administration/sso/

Recommendation

Update the sillytavern package to the latest compatible version. Followings are version details:

• Affected version(s): <= 1.17.0
• Patched version(s): 1.18.0

References

• GHSA-gxx6-h3g6-vwjh
• CVE-2026-44649
• CWE-290
• CWE-306
• CWE-346
• CWE-807
• CAPEC-310
• OWASP 2021-A4
• OWASP 2021-A6
• OWASP 2021-A7

Related Issues

• FUXA has JWT Authentication Bypass via HTTP Referer header spoofing - CVE-2025-69985
• fast-xml-parser has an entity encoding bypass via regex injection in DOCTYPE entity names - CVE-2026-25896
• LobeHub: Unauthenticated authentication bypass on `webapi` routes via forgeable `X-lobe-chat-auth` header - CVE-2026-39411
• Astro has Full-Read SSRF in error rendering via Host: header injection - CVE-2026-25545

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Tags:

npm

sillytavern