Cross-site scripting in LibreChat - #VU133253
Published: June 3, 2026
Vulnerability identifier: #VU133253
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibreChat
Affected software:
LibreChat
LibreChat
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary script in the victim's browser.
The vulnerability exists due to cross-site scripting in the markdown artifact preview pipeline when rendering crafted markdown image alt text. A remote user can import a crafted conversation and share a public link to execute arbitrary script in the victim's browser.
User interaction is required to open the shared conversation link.
Remediation
Install security update from vendor's website.