CVE-2026-120323 Details
Description
A security flaw has been discovered in samanhappy MCPHub up to 1.0.45/1.1.7. Impacted is an unknown function of the file src/utils/passthroughHeaders.ts. The manipulation of the argument passthroughHeaders results in information disclosure. The attack may be launched remotely. Upgrading to version 1.1.8 is recommended to address this issue. The patch is identified as 040f7b9ae004070bdfe5084cde6bc2c609f78e76. It is advisable to upgrade the affected component.
A vulnerability allowing credential exfiltration has been identified in MCPHub versions through 1.0.45, specifically within the OpenAPI integration. The issue arises from the 'passthroughHeaders' configuration, which can be exploited to forward sensitive authentication headers from the user invoking a tool to an attacker-controlled endpoint. This vulnerability was verified in version 1.0.45 and exists in all releases with OpenAPI passthrough support.
Users are advised to upgrade to MCPHub version 1.1.8, which addresses this vulnerability by adding a denylist for dangerous headers in the passthrough configuration. After updating, review and adjust any server configurations that may still expose sensitive headers.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 2, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/0xGenesi/CVE/blob/main/MCPHub_OpenAPI_passthroughHeaders_Credential_Exfiltration.md | CISA-ADP | ExploitRemedyTechnical Analysis |
| https://github.com/0xGenesi/CVE/blob/main/MCPHub_OpenAPI_passthroughHeaders_Credential_Exfiltration.md | [email protected] | ExploitRemedyTechnical Analysis |
| https://github.com/samanhappy/mcphub/ | [email protected] | ProductVendor |
| https://github.com/samanhappy/mcphub/commit/040f7b9ae004070bdfe5084cde6bc2c609f78e76 | [email protected] | Source CodeVendor |
| https://github.com/samanhappy/mcphub/releases/tag/v1.1.8 | [email protected] | Release NotesVendor |
| https://vuldb.com/cve/CVE-2026-120323 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1015029 | [email protected] | Permission Required |
| https://vuldb.com/vuln/429655 | [email protected] | Permission Required |
| https://vuldb.com/vuln/429655/cti | [email protected] | AdvisoryPermission Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | [email protected] |
| CWE-284 | Improper Access Control | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| samanhappy MCPHub | <= 1.0.45 (semver) <= 1.1.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Nov 2, 2026 | New CVE Received | [email protected] |