Improper Verification of Source of a Communication Channel Affecting sillytavern package, versions <1.13.4
Threat Intelligence
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-13450627
- published8 Oct 2025
- disclosed6 Oct 2025
- creditAtomicByte
Introduced: 6 Oct 2025
NewCVE-2025-59159 (opens in a new tab)How to fix?
Upgrade sillytavern to version 1.13.4 or higher.
Overview
sillytavern is a LLM Frontend for Power Users
Affected versions of this package are vulnerable to Improper Verification of Source of a Communication Channel via improper validation of the Host header in inbound HTTP requests. An attacker can gain unauthorized access to sensitive data, execute arbitrary code, and perform actions such as installing malicious extensions or injecting arbitrary HTML by leveraging DNS rebinding techniques.
Note: The vulnerability has been patched by introducing a server configuration setting that enables a validation of host names in inbound HTTP requests; However, the setting is disabled by default to maintain backwards compatibility. Users are recommended to review their server configurations and apply necessary changes to their setup.