# Improper Access Control in Splunk Enterprise

CVE record · `CVE-2026-20259`

- **Identifiers:** `CVE-2026-20259`
- **State:** Confirmed
- **Severity:** CVSS 5.5 Medium
- **Critical:** No
- **CNA:** cisco
- **Weakness (CWE):** [CWE-284](https://cwe.mitre.org/data/definitions/284.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Technologies:** [Splunk Enterprise](https://agentprime.io/advisories/technology/splunk-enterprise.md) · [Splunk Cloud Platform](https://agentprime.io/advisories/technology/splunk-cloud-platform.md)
- **Published:** 10 Jun 2026
- **Updated:** 10 Jun 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: cisco) at 10 Jun 2026, 17:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Splunk. Product: Splunk Enterprise.
  - affected: `10.2 to before 10.2.4` (custom)
  - affected: `10.0 to before 10.0.7` (custom)
- Vendor: Splunk. Product: Splunk Cloud Platform.
  - affected: `10.3.2512 to before 10.3.2512.12` (custom)
  - affected: `10.2.2510 to before 10.2.2510.15` (custom)
  - affected: `10.1.2507 to before 10.1.2507.23` (custom)
  - affected: `10.0.2503 to before 10.0.2503.14` (custom)
  - affected: `9.3.2411 to before 9.3.2411.131` (custom)

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 5.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N`, from CNA (cisco)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0019, the 8th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 10 Jun 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-20259](https://www.cve.org/CVERecord?id=CVE-2026-20259)
- [NVD: CVE-2026-20259](https://nvd.nist.gov/vuln/detail/CVE-2026-20259)

### References from the CNA

- <https://advisory.splunk.com/advisories/SVD-2026-0609>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-20259>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-20259/>. Everything for agents: <https://agentprime.io/llms.txt>.