MCP Toolbox for Databases has an Origin Validation Error
CriticalCVE-2026-11624 · Published Jun 13, 2026 · updated Sep 10, 2026
The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced alongside the existing "--allowed-origins" flag, enabling users to specify permitted hosts at server startup. Both flags default to "*", allowing users to implement strict access controls as needed without breaking existing setups. If either flag is set to "*", the server will output a startup warning about potential vulnerabilities. Documentation has also been updated to highlight these security considerations.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| github.com/googleapis/mcp-toolbox Go | < 0.25.0 | 0.25.0 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-346
- Also known as
- CVE-2026-11624, GO-2026-6288
More mcp-toolbox advisories
All mcp-toolbox| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jun 29 | MCP Toolbox HTTP tool path parameters allow traversal to unintended endpoints Critical9.1Jun 29 | Critical9.1 | 1.3.0 |
| Jun 18 | MCP Toolbox for Databases: authenticated authorization bypassHighJun 18 | High | 1.4.0 |
| Jun 18 | mcp-toolbox: authentication bypassCriticalJun 18 | Critical | 1.4.0 |
| Jun 18 | mcp-toolbox: authentication bypassCriticalJun 18 | Critical | 1.4.0 |
| May 28 | MCP Toolbox for Databases vulnerable to DNS rebinding attacksCriticalMay 28 | Critical | 1.2.0 |