High [CVE-2026-76251] Missing Authorization through REST API Endpoints in the Splunk App for Splunk Observability Cloud
This high-severity Splunk advisory covers CVE-2026-76251 affecting Splunk Enterprise.
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Summary
In Splunk Enterprise versions below 10.4.2, 10.2.6, and 10.0.9, a user who does not hold the "admin" or "power" Splunk roles could cause the Splunk App for Splunk Observability Cloud to forward requests to Splunk Observability Cloud, including the Splunk Observability Cloud access token stored for the app.
With this access, the user could view all relevant data available to that token and make limited changes to Splunk Observability Cloud content. The vulnerability is possible because the app's Representational State Transfer (REST) API endpoint handlers do not enforce the read_o11y_content capability before forwarding requests with the stored access token.
For more information see Define roles on the Splunk platform with capabilities ( ) in the Splunk documentation.
- Splunk Enterprise 10.4 before 10.4.2
- Splunk Enterprise 10.2 before 10.2.6
- Splunk Enterprise 10.0 before 10.0.9
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- 10.4.2
- 10.2.6
- 10.0.9
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: 10.4.2, 10.2.6, 10.0.9. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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