CVE-2026-20256— Improper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk Enterprise
Affected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-20258
Stored Cross-Site Scripting (XSS) through Classic Dashboard - CVE-2026-20253
Unauthenticated Arbitrary File Creation and Truncation in a - CVE-2026-20252
Server-Side Request Forgery (SSRF) through Dashboard Studio - CVE-2026-20257
Improper Input Validation through Classic Dashboard CSS in S - CVE-2026-20259
Improper Access Control in Splunk Enterprise
Same vendor: Splunk
- CVE-2026-20266
OS Command Injection in the btool Configuration Helper in Sp - CVE-2026-20265
Insecure Default Domain Allowlist in Splunk AI Toolkit - CVE-2026-20258
Stored Cross-Site Scripting (XSS) through Classic Dashboard - CVE-2026-20253
Unauthenticated Arbitrary File Creation and Truncation in a - CVE-2026-20260
Log Injection through HTTP Request Paths in Splunk SOAR
Same weakness: CWE-20
- CVE-2026-48774
ProxySQL MCP run_sql_readonly executes side-effecting MySQL - CVE-2026-21768
HCL Verse for Android is susceptible to an injection vulnera - CVE-2026-39998
Apache APISIX: Identity Injection via forward-auth Plugin Mi - CVE-2025-58175
GeoServer has a Server-Side Request Forgery (SSRF) Vulnerabi - CVE-2026-12569
Remote Code Execution (RCE) vulnerability in Windchill PDMli
V. Comments for CVE-2026-20256
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