CVE-2026-44651 Details
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, when fetch(url) throws, the code sends: res.status(500).send('Error occurred while trying to proxy to: ' + url + ' ' + error). The url value is attacker-controlled (req.params.url) and is not HTML-escaped before rendering. This vulnerability is fixed in 1.18.0.
A reflected cross-site scripting vulnerability has been identified in SillyTavern versions prior to 1.18.0. This issue arises in the CORS proxy middleware, where an attacker can inject malicious scripts through the 'url' parameter. When the 'fetch' function fails, the error response includes the unescaped URL, creating an opportunity for script execution in the context of the user.
Users are advised to update to SillyTavern version 1.18.0 or later. In addition, avoid including raw user input in HTML error responses without proper sanitization. If it is necessary to echo URLs, ensure they are HTML-escaped or output as plain text. Reinforcing the Content Security Policy can also help mitigate the impact of such reflected injections.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 29, 2026CISA-ADP
Assessed Jun 1, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-xc4x-2452-5gc9 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SillyTavern | <= 1.17.0 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 29, 2026 | New CVE Received | [email protected] |