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CVE-2026-20255: The product does not validate or incorrectly validates input that can affect the control flow or data flow of a program. in Splunk Splunk Enterprise

0
Medium
VulnerabilityCVE-2026-20255cvecve-2026-20255
Published: Wed Jun 10 2026 (06/10/2026, 17:16:00 UTC)
Source: CVE Database V5
Vendor/Project: Splunk
Product: Splunk Enterprise

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 v3.1

Score 5.7medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Affected software

Affected versions
10.210.09.49.3

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 06/10/2026, 18:25:48 UTC

Technical Analysis

This vulnerability in Splunk Enterprise and Splunk Cloud Platform arises from incomplete validation of URLs in the external content dialog. Low-privileged users lacking admin or power roles can exploit this by creating malicious classic dashboards that cause data exfiltration to external servers. The affected versions include 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. The vulnerability does not affect confidentiality, integrity, or availability beyond the described data exfiltration vector. There is no known exploit in the wild and no vendor advisory or patch information provided in the input data.

Potential Impact

An attacker with low privileges can exfiltrate sensitive data by exploiting incomplete URL validation in dashboards, potentially leading to unauthorized data disclosure. The vulnerability does not allow privilege escalation, integrity modification, or denial of service. The impact is limited to confidentiality with a medium severity rating (CVSS 5.7).

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is indicated in the provided data. Until a patch is available, restrict dashboard creation permissions to trusted users and monitor for unusual dashboard activity involving external content dialogs.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.401Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a29aa2b1a4077f7803bb975

Added to database: 6/10/2026, 6:17:15 PM

Last enriched: 6/10/2026, 6:25:48 PM

Last updated: 6/11/2026, 12:41:08 AM

Views: 7

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