| Component | LibreChat |
| Severity | medium (CVSS 6.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N |
| Published (NVD) | 2026-03-27 |
| Last modified | 2026-06-17 |
| Affected versions | librechat >= 0.8.2, < 0.8.3 librechat = 0.8.3 |
| Fixed in | 0.8.3 |
| Weakness | CWE-200 |
| CISA KEV | not listed |
NVD description
LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP (Model Context Protocol) servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attacker can create a malicious MCP server with headers containing `{{LIBRECHAT_OPENID_ACCESS_TOKEN}}` (and others), causing victims who call tools on that server to have their OAuth tokens exfiltrated. Version 0.8.3-rc2 fixes the issue.
What to do
- Upgrade LibreChat to
0.8.3or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
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