CVE-2026-79745 samanhappy CVE debrief

Who should care

Defenders responsible for MCPHub deployments should assess exposure and apply the patch to prevent unauthorized integrity violations. This includes reviewing and enhancing role checking and access controls, monitoring for unauthorized changes, and verifying system configurations. Prioritization should be given to deployments with high-risk configurations or those serving sensitive data.

Why it matters

Defenders should prioritize verifying exposure and applying the patch to prevent unauthorized integrity violations in MCPHub deployments.

• Potential for unauthorized changes to global prompt templates and resources
• Risk of stored prompt injection into other users' LLM sessions
• Need for verification of role checking and access controls
• Priority for patching and monitoring MCPHub deployments

Technical summary

The MCPHub vulnerability allows non-admin users to create, overwrite, and shadow global prompt templates and resources due to a lack of role checking in the built-in prompt and resource controllers. This issue results in an unauthorized integrity violation, potentially leading to stored prompt injection into other users' LLM sessions. The vulnerability is patched in version 1.0.32, and defenders should prioritize verifying exposure and applying the patch, focusing on role checking and access controls for MCPHub. A thorough review of system configurations and vigilant monitoring for suspicious activity are also recommended.

Defensive priority

Defenders should prioritize verifying exposure and applying the patch, focusing on role checking and access controls for MCPHub.

Recommended defensive actions

• Verify MCPHub version and apply patch to version 1.0.32 or later
• Review and enhance role checking and access controls for MCPHub
• Monitor for unauthorized changes to global prompt templates and resources
• Conduct a thorough review of system configurations to identify potential exposure
• Implement compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its impact, and the patched version. However, additional information on affected deployments and potential consequences is limited. Defenders should verify role checking and access controls, focusing on MCPHub deployments. The lack of specific details on affected systems and potential downstream consequences necessitates a thorough review of system configurations and vigilant monitoring for suspicious activity.

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.