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CVE-2026-20258— Stored Cross-Site Scripting (XSS) through Classic Dashboard 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存在跨站脚本漏洞，该漏洞源于经典仪表盘HTML面板中可存储恶意脚本，可能导致低权限用户在另一用户浏览器中执行未经授权的JavaScript代码。以下产品及版本受到影响：Splunk

CVSS 7.1 · High EPSS 0.24% · P13

Affected Version Matrix 8

VendorProduct Version RangeStatus
Splunk Splunk Cloud Platform 10.3.2512< 10.3.2512.11 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-2026-20258

Vulnerability Information
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Vulnerability Title
Stored Cross-Site Scripting (XSS) through Classic Dashboard 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 10.3.2512.11, 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 store a malicious script in a classic dashboard HTML panel, causing unauthorized JavaScript code to execute in the browser of another user. The vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The low-privileged user should not be able to exploit the vulnerability at will.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Cloud Platform和Splunk Enterprise 跨站脚本漏洞
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存在跨站脚本漏洞，该漏洞源于经典仪表盘HTML面板中可存储恶意脚本，可能导致低权限用户在另一用户浏览器中执行未经授权的JavaScript代码。以下产品及版本受到影响：Splunk
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 ~ 10.3.2512.11 -

II. Public POCs for CVE-2026-20258

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III. Intelligence Information for CVE-2026-20258

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Vendor Advisories for CVE-2026-20258 (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-2026-20254 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-2026-20256 5.7 MEDIUM Improper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk En
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-79

V. Comments for CVE-2026-20258

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