Reliance on Untrusted Inputs in a Security Decision Affecting sillytavern package, versions <1.18.0
Threat Intelligence
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Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SILLYTAVERN-16691316
- published14 May 2026
- disclosed12 May 2026
- creditspl::kirakira
Introduced: 12 May 2026
CVE-2026-44649 (opens in a new tab)How to fix?
Upgrade sillytavern to version 1.18.0 or higher.
Overview
sillytavern is a LLM Frontend for Power Users
Affected versions of this package are vulnerable to Reliance on Untrusted Inputs in a Security Decision via the headerUserLogin function. An attacker can gain unauthorized access to any user account, including administrators, by injecting crafted HTTP headers such as Remote-User or X-Authentik-Username when SSO is enabled.
Note: This is only exploitable if either sso.autheliaAuth: true or sso.authentikAuth: true is set in the configuration file.