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

2026-10-08T12:17:35.974887+00:00

Affected: Splunk Enterprise, Splunk Cloud Platform

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.

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.

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