Splunk Enterprise and Cloud Platform
CVE-2026-20254: Information Disclosure through External Content Restriction Bypass in Splunk Enterprise
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Splunk Enterprise 10.2 | 10.2.4 or later |
| Splunk Enterprise 10.0 | 10.0.7 or later |
| Splunk Enterprise 9.4 | 9.4.12 or later |
| Splunk Enterprise 9.3 | 9.3.13 or later |
| Splunk Cloud Platform 10.3 | 10.3.2512.13 or later |
| Splunk Cloud Platform 10.2 | 10.2.2510.15 or later |
| Splunk Cloud Platform 10.1 | 10.1.2507.23 or later |
| Splunk Cloud Platform 9.3 | 9.3.2411.132 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.