CyberCVE

CVE-2026-20254

Information Disclosure through External Content Restriction Bypass in Splunk Enterprise

Severity
Medium 5.7
CVSS 3.1
Exploited
Not listed
EPSS
0.004
33.5th percentile
Discovered by
Not disclosed
Published
Jun 10, 2026
Assigned by cisco

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.

Weakness: CWE-20

Affected products

Vendor Product Category Matched by

No product mapping yet — this CVE is pending taxonomy review.

Vendor-reported affected versions (2)
  • Splunk · Splunk Enterprise
  • Splunk · Splunk Cloud Platform

Credit

Fredrik Alexandersson (stok)

References