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CVE-2026-76303— Stored Cross-Site Scripting (XSS) through App Documentation in Splunk SOAR

Quick assessment

Affected
Splunk Splunk SOAR
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.

在 Splunk SOAR 8.7.0 之前的版本中，拥有"install_apps"权限角色的用户可以安装一个应用，从而将攻击者控制的内容存储到 Splunk SOAR 的应用文档中。当另一位拥有“查看应用”权限角色的用户打开该应用文档时，Splunk SOAR 可能会在该用户的浏览器中执行上述内容。利用此访问权限，第一位用户即可执行第二位用户（即打开应用文档的用户）所能执行的所有数据访问和修改操作。 该漏洞产生的原因是：Splunk SOAR 在展示应用文档内容之前，未对其进行清理（sanitization）处

CVSS 5.7 · Medium
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I. Basic Information for CVE-2026-76303

Vulnerability Information
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Vulnerability Title
Stored Cross-Site Scripting (XSS) through App Documentation in Splunk SOAR
Source: CVE Program / CVE List V5
Vulnerability Description
In Splunk SOAR versions below 8.7.0, a user that holds a role with the install_apps capability could store attacker-controlled content that Splunk SOAR displays in app documentation by installing an app. If another user who holds a role with permission to view apps opens the app documentation, Splunk SOAR could run that content in the browser of the user who opened the app documentation. With this access, the first user could access data and make changes that the user who opened the app documentation could make. The vulnerability is possible because Splunk SOAR does not sanitize app documentation content before it displays that content. The vulnerability requires the attacker to phish the affected user by tricking them into initiating a request within their browser. The user that holds a role with the install_apps capability should not be able to exploit the vulnerability at will. For more information see Manage roles and permissions in Splunk SOAR (On-premises) (https://help.splunk.com/en/splunk-soar/soar-on-premises/administer-soar-on-premises/7.1.0/manage-your-splunk-soar-on-premises-users-and-accounts/manage-roles-and-permissions-in-splunk-soar-on-premises) and Add and configure apps and assets to provide actions in Splunk SOAR (On-premises) (https://help.splunk.com/en/splunk-soar/soar-on-premises/administer-soar-on-premises/8.6.0/manage-your-splunk-soar-on-premises-apps-and-assets/add-and-configure-apps-and-assets-to-provide-actions-in-splunk-soar-on-premises) in the Splunk documentation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk SOAR 0 ~ 8.7.0 -

II. Public POCs for CVE-2026-76303

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III. Intelligence Information for CVE-2026-76303

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Other References for CVE-2026-76303 (1)

Same Patch Batch · Splunk · 2026-10-21 · 31 CVEs total

CVE-2026-76291 8.8 HIGH Improper Access Control through Scheduled Search Safeguards in Splunk Enterprise
CVE-2026-76298 8.8 HIGH Use of Hard-coded Cryptographic Key in the PostgreSQL Sidecar Service in Splunk Enterprise
CVE-2026-76306 7.5 HIGH Information Disclosure through REST API Query Filters in Splunk SOAR
CVE-2026-76290 7.5 HIGH Denial of Service (DoS) through Unauthenticated Package Downloads over the REST API in Spl
CVE-2026-76288 7.5 HIGH Denial of Service (DoS) through Splunk Web Content-Type Header Parsing in Splunk Enterpris
CVE-2026-76307 7.2 HIGH Sensitive Information Disclosure through REST API Query Filters in Splunk SOAR
CVE-2026-76293 7.2 HIGH Remote Code Execution (RCE) through Splunk Web Manager Extensible Markup Language (XML) in
CVE-2026-76308 6.5 MEDIUM Missing Authorization through the REST API in Splunk SOAR
CVE-2026-76305 6.5 MEDIUM Improper Access Control during App Downloads in Splunk SOAR
CVE-2026-76292 6.5 MEDIUM Missing Authorization through REST API Endpoints in Splunk Secure Gateway
CVE-2026-76289 6.5 MEDIUM Denial of Service (DoS) through the REST API in Splunk Enterprise
CVE-2026-76406 5.9 MEDIUM Information Disclosure through REST API Authentication in Splunk SOAR
CVE-2026-76287 5.4 MEDIUM Authorization Bypass in the Data Management REST API in Splunk Enterprise
CVE-2026-76296 4.3 MEDIUM Missing Authorization through Sourcetype Renaming in Splunk Web for Splunk Enterprise
CVE-2026-76295 4.3 MEDIUM SPL Injection through the REST API in Splunk Secure Gateway
CVE-2026-76304 4.3 MEDIUM Sensitive Information Disclosure through Automation Broker Configuration in Splunk SOAR
CVE-2026-76294 4.3 MEDIUM Improper Access Control in Field Extraction Management in Splunk Enterprise
CVE-2026-76297 4.2 MEDIUM Federated Search Provider State Change through Cross-Site Request Forgery (CSRF) in Splunk
CVE-2026-76301 Security Hardening in Splunk Enterprise - October 2026
CVE-2026-76300 Security Hardening in Splunk Enterprise - October 2026

Showing top 20 of 31 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Splunk SOAR
Same vendor: Splunk
Same weakness: CWE-79

V. Comments for CVE-2026-76303

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