Medium severity · published Jun 10, 2026
CVE-2026-20255
Improper Input Validation through Classic Dashboards 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.
The vulnerability exists because URL validation on the external content dialog is incomplete, which can allow for requests to untrusted domains when a user interacts with 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 29% 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-2026-20255
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20255
Vendor Advisory
https://advisory.splunk.com/advisories/SVD-2026-0605
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