CVE-2026-120323 samanhappy CVE debrief

Who should care

Defenders responsible for samanhappy MCPHub deployments, security teams, and vulnerability management teams should assess exposure and apply the patch or upgrade to version 1.1.8. This includes teams managing affected product deployments, as well as those responsible for monitoring and incident response, to ensure that exposure is verified and mitigated to prevent potential remote attacks and information disclosure risks associated with this vulnerability.

Why it matters

CVE-2026-120323 is a security flaw in samanhappy MCPHub that allows for information disclosure. Defenders should prioritize verifying exposure and applying the patch or upgrading to version 1.1.8.

• Verify exposure of MCPHub versions up to 1.0.45/1.1.7
• Apply patch or upgrade to version 1.1.8 to prevent information disclosure
• Monitor for potential remote attacks

Technical summary

The vulnerability is located in the src/utils/passthroughHeaders.ts file of samanhappy MCPHub up to 1.0.45/1.1.7. The manipulation of the passthroughHeaders argument results in information disclosure. The attack may be launched remotely. Defenders should prioritize verifying exposure of MCPHub versions up to 1.0.45/1.1.7 and applying the patch or upgrading to version 1.1.8 to prevent information disclosure and potential remote attacks on affected systems and data confidentiality and integrity risks associated with remote exploitation.

Defensive priority

Defenders should prioritize verifying exposure of MCPHub versions up to 1.0.45/1.1.7 and applying the patch or upgrading to version 1.1.8.

Recommended defensive actions

• Verify exposure of MCPHub versions up to 1.0.45/1.1.7
• Apply the patch or upgrade to version 1.1.8
• Monitor for potential remote attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and recommended actions. Defenders should verify exposure of MCPHub versions up to 1.0.45/1.1.7 and review the patch or upgrade to version 1.1.8. Evidence is limited to public CVE and NVD information, and defenders should exercise caution when assessing exposure.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.