CVE-2026-76270 Splunk CVE debrief

Who should care

Splunk Enterprise administrators and users with the list_spl2_modules capability should assess their exposure and take necessary actions to prevent potential data exposure. This includes verifying the presence of this vulnerability in their Splunk Enterprise instances, applying necessary patches, restricting access to the list_spl2_modules capability, and monitoring for suspicious activity on the affected REST API.

Why it matters

This SQL injection vulnerability in Splunk Enterprise can lead to potential data exposure for users with the list_spl2_modules capability, emphasizing the need for prompt verification and patching.

• Potential data exposure through the affected REST API
• Need to verify the presence of this vulnerability in Splunk Enterprise instances
• Requirement to restrict access to the list_spl2_modules capability
• Necessity to monitor for suspicious activity on the affected REST API

Technical summary

The vulnerability exists in Splunk Enterprise versions below 10.4.3, where a user with the list_spl2_modules capability can use SQL injection in SPL2 module filtering to access all relevant data available through the affected REST API. This SQL injection vulnerability can lead to potential data exposure for users with the list_spl2_modules capability, emphasizing the need for prompt verification and patching. The vulnerability is caused by the lack of parameterization of user-supplied values in database queries for SPL2 module filtering.

Defensive priority

Defenders should prioritize verifying the presence of this vulnerability in their Splunk Enterprise instances and apply the necessary patches to prevent potential data exposure.

Recommended defensive actions

• Verify the presence of this vulnerability in Splunk Enterprise instances
• Apply necessary patches to prevent potential data exposure
• Restrict access to the list_spl2_modules capability
• Monitor for suspicious activity on the affected REST API
• 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 vulnerability is possible because Splunk Enterprise and Splunk Cloud Platform do not parameterize user-supplied values before using them in database queries for SPL2 module filtering. This lack of parameterization allows users with the list_spl2_modules capability to inject SQL and access all relevant data available through the affected REST API, including private SPL2 module definitions belonging to other users. To verify the presence of this vulnerability, defenders should review their Splunk Enterprise instances and check for 9

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.