Vulnerability · Published Jun 10, 2026 · Assigned by cisco
CVE-2026-20254Information Disclosure through External Content Restriction Bypass in Splunk Enterprise
Medium 5.7
In plain English
A medium-severity improper input validation in Splunk Cloud Platform from Splunk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Splunk | Splunk Enterprise | 10.2 – before 10.2.410.0 – before 10.0.79.4 – before 9.4.129.3 – before 9.3.13 |
| Splunk | Splunk Cloud Platform | 10.3.2512 – before 10.3.2512.1310.2.2510 – before 10.2.2510.1510.1.2507 – before 10.1.2507.239.3.2411 – before 9.3.2411.132 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N