CVE-2026-20254

MEDIUM

Information Disclosure through External Content Restriction Bypass in Splunk Enterprise

Title source: cna
STIX 2.1

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.

References (1)

Core 1

Scores

CVSS v3 5.7
EPSS 0.0025
EPSS Percentile 16.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-20
Status published
Products (10)
splunk/splunk 9.3.0 - 9.3.13
Splunk/Splunk Cloud Platform 10.1.2507 - 10.1.2507.23
Splunk/Splunk Cloud Platform 10.2.2510 - 10.2.2510.15
Splunk/Splunk Cloud Platform 10.3.2512 - 10.3.2512.13
Splunk/Splunk Cloud Platform 9.3.2411 - 9.3.2411.132
Splunk/Splunk Enterprise 10.0 - 10.0.7
Splunk/Splunk Enterprise 10.2 - 10.2.4
Splunk/Splunk Enterprise 9.3 - 9.3.13
Splunk/Splunk Enterprise 9.4 - 9.4.12
splunk/splunk_cloud_platform 9.3.2411 - 9.3.2411.132
Published Jun 10, 2026
Tracked Since Jun 11, 2026