Medium severity · published Jun 10, 2026
CVE-2026-20254
Information Disclosure through External Content Restriction Bypass in Splunk Enterprise
5.7
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SC
Splunk Cloud Platform · Splunk
10.3.2512 before 10.3.2512.13; 10.2.2510 before 10.2.2510.15; 10.1.2507 before 10.1.2507.23; 9.3.2411 before 9.3.2411.132 · source: vendor, NVD
SE
Splunk Enterprise · Splunk
10.2 before 10.2.4; 10.0 before 10.0.7; 9.4 before 9.4.12; 9.3 before 9.3.13 · source: vendor
SP
Splunk · Splunk
9.3.0 before 9.3.13; 9.4.0 before 9.4.12; 10.0.0 before 10.0.7; 10.2.0 before 10.2.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20254
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20254
Vendor Advisory
https://advisory.splunk.com/advisories/SVD-2026-0604
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