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Splunk Enterprise CVE-2026-20254

| EUVD-2026-36081 MEDIUM
Improper Input Validation (CWE-20)
2026-06-10 cisco GHSA-c58f-cc4q-2mvj
5.7
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.7 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Lifecycle Timeline

2
Patch available
Jun 10, 2026 - 20:01 EUVD
Analysis Generated
Jun 10, 2026 - 18:59 vuln.today

DescriptionCVE.org

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.

AnalysisAI

CSS injection in Splunk Enterprise and Splunk Cloud Platform classic dashboards enables credential and sensitive data exfiltration by low-privileged users targeting higher-privileged accounts. A low-privileged user (without 'admin' or 'power' roles) can craft a malicious classic dashboard containing injected CSS via inline style attributes; when a higher-privileged user views the dashboard, outbound HTTP requests are triggered to attacker-controlled external servers, bypassing the Trusted Domains restriction. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privileged Splunk account
Delivery
Craft classic dashboard with CSS injection payload
Exploit
Position dashboard for admin visibility
Execution
Admin user opens dashboard in browser
Persist
Browser processes injected CSS and issues outbound request
Impact
Sensitive data or session credentials exfiltrated to attacker server

Vulnerability AssessmentAI

Exploitation The attacker must hold a valid low-privileged Splunk account that does not have the 'admin' or 'power' role. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS base score of 5.7 (Medium) reflects the required user interaction (UI:R) and low-privilege prerequisite (PR:L), which temper what would otherwise be a more severe rating given the C:H confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a low-privileged Splunk account crafts a classic dashboard embedding CSS injection payloads in inline style attributes - for example, using a CSS url() directive pointing to an attacker-controlled server - then saves or shares the dashboard in a location accessible to administrative users. When a higher-privileged user opens the dashboard in their browser, their Splunk session triggers the CSS-driven outbound request, potentially transmitting session tokens or credential material to the attacker's server. …
Remediation The primary remediation is to upgrade to a patched release. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-20254 vulnerability details – vuln.today

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