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CVE-2026-20256— Improper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk Enterprise

Quick assessment

Affected
Splunk Splunk Enterprise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Splunk Cloud Platform和Splunk Enterprise都是美国Splunk公司的产品。Splunk Cloud Platform是一个强大的数据收集、处理和分析服务。Splunk Enterprise是一套数据收集分析软件。 Splunk Cloud Platform和Splunk Enterprise存在输入验证错误漏洞，该漏洞源于经典仪表盘中的URL分类器仅识别http://和https://协议，可能导致低权限用户通过协议相对URL在钻取链接中将受害者重定向到外部站点。以下产

CVSS 5.7 · Medium EPSS 0.36% · P29

Affected Version Matrix 8

VendorProduct Version RangeStatus
Splunk Splunk Cloud Platform 10.3.2512< 10.3.2512.13 affected
10.2.2510< 10.2.2510.15 affected
10.1.2507< 10.1.2507.23 affected
9.3.2411< 9.3.2411.132 affected
Splunk Splunk Enterprise 10.2< 10.2.4 affected
10.0< 10.0.7 affected
9.4< 9.4.12 affected
9.3< 9.3.13 affected
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I. Basic Information for CVE-2026-20256

Vulnerability Information
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Vulnerability Title
Improper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk Enterprise
Source: CVE Program / CVE List V5
Vulnerability 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 cause data exfiltration through classic dashboards by redirecting a victim to an external site using a protocol-relative URL in a drill-down link.<br><br>The vulnerability exists because the URL classifier in classic dashboards only recognizes `http://` and `https://` schemes when checking for external URLs. Protocol-relative URLs such as `//attacker.com` bypass this check entirely, and Splunk Web does not show the external-navigation warning dialog to the victim.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Cloud Platform和Splunk Enterprise 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk Cloud Platform和Splunk Enterprise都是美国Splunk公司的产品。Splunk Cloud Platform是一个强大的数据收集、处理和分析服务。Splunk Enterprise是一套数据收集分析软件。 Splunk Cloud Platform和Splunk Enterprise存在输入验证错误漏洞，该漏洞源于经典仪表盘中的URL分类器仅识别http://和https://协议，可能导致低权限用户通过协议相对URL在钻取链接中将受害者重定向到外部站点。以下产
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk Enterprise 10.2 ~ 10.2.4 -
Splunk Splunk Cloud Platform 10.3.2512 ~ 10.3.2512.13 -

II. Public POCs for CVE-2026-20256

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III. Intelligence Information for CVE-2026-20256

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Vendor Advisories for CVE-2026-20256 (1)

Same Patch Batch · Splunk · 2026-06-10 · 10 CVEs total

CVE-2026-20253 9.8 CRITICAL Unauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service End
CVE-2026-20251 8.8 HIGH Remote Code Execution through Deserialization of Untrusted Data in Splunk Secure Gateway
CVE-2026-20252 7.6 HIGH Server-Side Request Forgery (SSRF) through Dashboard Studio PDF Export in Splunk Enterpris
CVE-2026-20258 7.1 HIGH Stored Cross-Site Scripting (XSS) through Classic Dashboard in Splunk Enterprise
CVE-2026-20254 5.7 MEDIUM Information Disclosure through External Content Restriction Bypass in Splunk Enterprise
CVE-2026-20257 5.7 MEDIUM Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise
CVE-2026-20255 5.7 MEDIUM Improper Input Validation through Classic Dashboards in Splunk Enterprise
CVE-2026-20259 5.5 MEDIUM Improper Access Control in Splunk Enterprise
CVE-2026-20260 4.3 MEDIUM Log Injection through HTTP Request Paths in Splunk SOAR

IV. Related Vulnerabilities

Same product: Splunk Enterprise
Same vendor: Splunk
Same weakness: CWE-20

V. Comments for CVE-2026-20256

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