Vulnerability · Published May 29, 2026 · Assigned by GitHub_M

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

Medium 6.9

In plain English

A medium-severity cross-site scripting in SillyTavern from SillyTavern. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.3%top 74.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	sillytavern	1.18.0	GHSA-xc4x-2452-5gc9

Affected products (as reported)

Vendor	Product	Versions
SillyTavern	SillyTavern	< 1.18.0

Weakness: CWE-79 · 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

References

https://github.com/SillyTavern/SillyTavern/security/advisories/GHSA-xc4x-2452-5gc9 x_refsource_CONFIRM