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CVE-2026-20257— Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise

CVSS 5.7 · Medium EPSS 0.20% · P10

Affected Version Matrix 8

VendorProductVersion RangeStatus
SplunkSplunk Cloud Platform10.3.2512< 10.3.2512.13affected
10.2.2510< 10.2.2510.15affected
10.1.2507< 10.1.2507.23affected
9.3.2411< 9.3.2411.132affected
SplunkSplunk Enterprise10.2< 10.2.4affected
10.0< 10.0.7affected
9.4< 9.4.12affected
9.3< 9.3.13affected
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I. Basic Information for CVE-2026-20257

Vulnerability Information

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Vulnerability Title
Improper Input Validation through Classic Dashboard CSS 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 craft a classic dashboard that exfiltrates sensitive data from the browser of a higher-privileged user who views it. The exfiltration is possible because classic dashboard panels do not fully validate style attribute values, which can allow for requests to reach external domains outside the configured Trusted Domains List. 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: 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面板未完全验证样式属性值,可能导致低权限用户通过特制仪表盘从高权限用户浏览器窃取敏感数据。以下产品及版本受到影响:Splunk Enterp
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

VendorProductAffected VersionsCPESubscribe
SplunkSplunk Enterprise 10.2 ~ 10.2.4 -
SplunkSplunk Cloud Platform 10.3.2512 ~ 10.3.2512.13 -

II. Public POCs for CVE-2026-20257

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III. Intelligence Information for CVE-2026-20257

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Vendor Advisories for CVE-2026-20257 (1)

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

CVE-2026-202539.8 CRITICALUnauthenticated Arbitrary File Creation and Truncation in a PostgreSQL Sidecar Service End
CVE-2026-202518.8 HIGHRemote Code Execution through Deserialization of Untrusted Data in Splunk Secure Gateway
CVE-2026-202527.6 HIGHServer-Side Request Forgery (SSRF) through Dashboard Studio PDF Export in Splunk Enterpris
CVE-2026-202587.1 HIGHStored Cross-Site Scripting (XSS) through Classic Dashboard in Splunk Enterprise
CVE-2026-202545.7 MEDIUMInformation Disclosure through External Content Restriction Bypass in Splunk Enterprise
CVE-2026-202555.7 MEDIUMImproper Input Validation through Classic Dashboards in Splunk Enterprise
CVE-2026-202565.7 MEDIUMImproper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk En
CVE-2026-202595.5 MEDIUMImproper Access Control in Splunk Enterprise
CVE-2026-202604.3 MEDIUMLog Injection through HTTP Request Paths in Splunk SOAR

IV. Related Vulnerabilities

V. Comments for CVE-2026-20257

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