CVE-2026-34565: CI4MS Cross-Site Scripting Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xgh5-w62m-8mpr",
  "modified" : "2026-04-06T17:14:22Z",
  "published" : "2026-04-01T22:05:45Z",
  "aliases" : [ "CVE-2026-34565" ],
  "summary" : "CI4MS: Menu Management (Posts) Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS",
  "details" : "## Summary\n### **Vulnerability: Stored DOM XSS via Posts Added to Menu (Persistent Payload Injection)**\n- Stored Cross-Site Scripting via Unsafe Rendering of Post Entries in Menu Management\n\n### Description\nThe application fails to properly sanitize user-controlled input when **adding Posts to navigation menus** through the Menu Management functionality. Post-related data selected via the Posts section is stored server-side and rendered without proper output encoding.\n\nThese stored values are later rendered unsafely within administrative dashboards and public-facing navigation menus, resulting in stored DOM-based cross-site scripting (XSS).\n\n### Affected Functionality\n- Menu Management – Posts section\n- Adding posts to navigation menus\n- Menu storage and rendering logic\n\n### Attack Scenario\n- An attacker creates or controls a post containing a malicious JavaScript payload.\n- The attacker adds the post to the menu using the **Posts** functionality in Menu Manager.\n- The application stores the menu entry without sanitization or encoding.\n- The payload persists and executes whenever the menu is rendered.\n\n### Impact\n- Persistent Stored DOM XSS\n- Execution of arbitrary JavaScript in victims’ browsers\n- Privilege escalation in administrative contexts\n- Full administrator account takeover\n- Full account takeover across all roles\n- Full compromise of the entire application via global navigation execution\n\nEndpoint:\n- `/backend/menu/`\n\n## Steps To Reproduce (POC)\n1. Navigate to Menu Management\n2. Use the **Posts** section to add a post containing an XSS payload such as:\n`<img src=x onerror=alert(document.domain)>`\n3. Save the menu\n4. View the menu in the administrative panel or any public-facing page\n5. Observe the JavaScript payload executing automatically\n\n## Remediation\n\n- **Avoid unsafe DOM manipulation methods:** Do not use `.html()`, `innerHTML`, or similar sink functions in client-side JavaScript or server-side templating (e.g., PHP). Even when user input flowing into these sinks is not immediately apparent, they can introduce Cross-Site Scripting (XSS) vulnerabilities that an attacker may exploit.\n\n- **Apply output encoding:** Implement HTML entity encoding on all user-controlled data before rendering it in the browser. This helps neutralize potentially malicious input.\n\n- **Implement input sanitization:** Ensure that all user-supplied input is properly sanitized before processing or output. Currently, no sanitization mechanisms are in place, which should be addressed as a priority.\n\n- **Enforce security headers and cookie attributes:**\n  - **Content Security Policy (CSP):** Define and enforce a strict CSP to limit the execution of unauthorized scripts.\n  - **HttpOnly flag:** Set the `HttpOnly` attribute on session cookies to prevent client-side script access.\n  - **SameSite attribute:** Configure the `SameSite` cookie attribute to mitigate Cross-Site Request Forgery (CSRF) risks.\n  - **Secure flag:** Ensure all cookies are transmitted only over HTTPS by enabling the `Secure` attribute.\n\n  These measures collectively reduce the impact of XSS and help prevent escalation paths such as CSRF via XSS.\n\n# Ready Video POC:\nhttps://mega.nz/file/PcMiUA5K#L2RlZJa340Q8K42TksxiXMuo_9XsRYPi14-WvBnak2A",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "ci4-cms-erp/ci4ms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.31.0.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.28.6.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-xgh5-w62m-8mpr"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34565"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ci4-cms-erp/ci4ms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-01T22:05:45Z",
    "nvd_published_at" : "2026-04-01T22:16:20Z"
  }
}