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CVE-2026-44651— SillyTavern: Reflected XSS vulnerability in the CORS proxy middleware

Quick assessment

Affected
SillyTavern SillyTavern
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SillyTavern是SillyTavern开源的一个大语言模型的前端界面。 SillyTavern 1.18.0之前版本存在跨站脚本漏洞，该漏洞源于当fetch(url)抛出时，代码发送包含攻击者控制的url值的错误响应，且该值未进行HTML转义。

AI Predicted 6.1 Difficulty: Easy EPSS 0.32% · P25

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
SillyTavern SillyTavern < 1.18.0 affected
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I. Basic Information for CVE-2026-44651

Vulnerability Information
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Vulnerability Title
SillyTavern: Reflected XSS vulnerability in the CORS proxy middleware
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
SillyTavern 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SillyTavern是SillyTavern开源的一个大语言模型的前端界面。 SillyTavern 1.18.0之前版本存在跨站脚本漏洞，该漏洞源于当fetch(url)抛出时，代码发送包含攻击者控制的url值的错误响应，且该值未进行HTML转义。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SillyTavern SillyTavern < 1.18.0 -

II. Public POCs for CVE-2026-44651

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III. Intelligence Information for CVE-2026-44651

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Vendor Advisories for CVE-2026-44651 (1)

Same Patch Batch · SillyTavern · 2026-05-29 · 6 CVEs total

CVE-2026-44649 9.8 CRITICAL SillyTavern: Authentication Bypass via SSO Header Injection
CVE-2026-44650 9.1 CRITICAL SillyTavern: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'
CVE-2026-46372 8.5 HIGH SillyTavern: SSRF in SearXNG Search Proxy via Unvalidated baseUrl
CVE-2026-44648 7.5 HIGH SillyTavern: Existing sessions are not invalidated after password change, allowing session
CVE-2026-44652 SillyTavern: SSRF vulnerability in the CORS proxy middleware

IV. Related Vulnerabilities

Same product: SillyTavern
Same vendor: SillyTavern
Same weakness: CWE-79

V. Comments for CVE-2026-44651

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