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.
Published: 2026-05-29
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-xc4x-2452-5gc9 SillyTavern has a reflected XSS vulnerability in the CORS proxy middleware
History

Mon, 01 Jun 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 29 May 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Sillytavern
Sillytavern sillytavern
Vendors & Products Sillytavern
Sillytavern sillytavern

Fri, 29 May 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title SillyTavern: Reflected XSS vulnerability in the CORS proxy middleware
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 6.9, 'vector': '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'}


Subscriptions

Sillytavern Sillytavern
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-01T15:20:31.759Z

Reserved: 2026-05-07T15:30:10.876Z

Link: CVE-2026-44651

cve-icon Vulnrichment

Updated: 2026-06-01T15:20:28.757Z

cve-icon NVD

Status : Deferred

Published: 2026-05-29T19:16:24.993

Modified: 2026-05-29T20:17:38.110

Link: CVE-2026-44651

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-29T19:30:05Z

Weaknesses