CVE-2026-76406 Splunk CVE debrief

Who should care

Splunk SOAR administrators, security teams, and users with access to encrypted credential data should assess exposure and prioritize remediation, verify affected versions, and restrict access to encrypted credential data to prevent potential decryption of encrypted credential data by unauthenticated users.

Why it matters

CVE-2026-76406 is a medium-severity vulnerability in Splunk SOAR that allows decryption of encrypted credential data. Defenders should prioritize remediation, verify affected versions, and restrict access to encrypted credential data.

• Potential decryption of encrypted credential data by unauthenticated users
• Possible exposure of sensitive credential data
• Need for verification of affected versions and remediation status
• Priority for updating Splunk SOAR instances to version 8.7.0 or later

Technical summary

The vulnerability in Splunk SOAR versions below 8.7.0 allows an unauthenticated user with access to encrypted credential data to expose and decrypt that data by submitting Basic authentication data to the REST API. This is possible because Splunk SOAR decrypts encrypted Basic authentication values before completing authentication checks. The vulnerability requires the unauthenticated user to have encrypted credential data from an affected Splunk SOAR instance, and defenders should prioritize remediation and verify affected versions.

Defensive priority

Medium priority for Splunk SOAR administrators and security teams

Recommended defensive actions

• Review and update Splunk SOAR instances to version 8.7.0 or later
• Restrict access to encrypted credential data
• Monitor REST API activity for suspicious authentication attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The CVE record and NVD detail page provide information about the vulnerability in Splunk SOAR versions below 8.7.0, which allows an unauthenticated user with access to encrypted credential data to expose and decrypt that data by submitting Basic authentication data to the REST API.

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.