CVE-2026-34558 (GCVE-0-2026-34558)

Vulnerability from cvelistv5 – Published: 2026-03-30 20:24 – Updated: 2026-03-31 15:25

Title

CI4MS: Methods Management Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

Summary

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to properly sanitize user-controlled input within the Methods Management functionality when creating or managing application methods/pages. Multiple input fields accept attacker-controlled JavaScript payloads that are stored server-side without sanitization or output encoding. These stored values are later rendered directly into administrative interfaces and global navigation components without proper encoding, resulting in Stored DOM-Based Cross-Site Scripting (XSS). This issue has been patched in version 0.31.0.0.

Severity ?

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

https://github.com/ci4-cms-erp/ci4ms/security/adv…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	ci4-cms-erp	ci4ms	Affected: < 0.31.0.0

Show details on NVD website

JSON

To clipboard

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GHSA-V77R-XG3P-75G7

Vulnerability from github – Published: 2026-04-01 00:09 – Updated: 2026-04-01 00:09

Summary

CI4MS: Methods Management Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

Details

Summary

Vulnerability: Stored DOM XSS via Methods Management Fields (Global Persistent Payload Execution)

Stored Cross-Site Scripting via Unsanitized Method Creation and Management Inputs
Automatic Execution Across All Pages Where Method Is Rendered in Navigation

Description

The application fails to properly sanitize user-controlled input within the Methods Management functionality when creating or managing application methods/pages. Multiple input fields accept attacker-controlled JavaScript payloads that are stored server-side without sanitization or output encoding.

These stored values are later rendered directly into administrative interfaces and global navigation components without proper encoding, resulting in Stored DOM-Based Cross-Site Scripting (XSS).

Critically, because created methods are automatically rendered inside the system’s navigation/menu structure, the injected payload executes globally — meaning every page visited where the malicious method appears in the menu triggers the XSS payload automatically.

This significantly increases severity, as exploitation is not limited to a single view — it becomes a platform-wide persistent execution point.

Affected Functionality

Methods creation functionality
Methods management and listing functionality
Administrative navigation rendering
Permission-related UI rendering
Global sidebar / menu rendering
Storage and retrieval of method-related data

Affected Fields

The following fields accept unsanitized input and allow persistent JavaScript injection: - Page Name
- Description
- Controller
- Method Name
- Seflink
- Page Order
- Symbol (FontAwesome 5)
- Permissions
- Parent Page
- Module

Attack Scenario

An attacker creates or edits a method.
The attacker injects a malicious XSS payload into any vulnerable field (e.g., Page Name).
The application stores the payload without sanitization or encoding.
The method is automatically rendered inside the application’s navigation/menu.
Every time any user visits any page where the menu is displayed, the malicious JavaScript executes automatically.

Because the navigation is globally rendered across backend pages, the XSS triggers on nearly every administrative page visit.

Impact

Persistent Stored DOM XSS
Automatic execution across multiple application pages
Execution of arbitrary JavaScript in victims’ browsers
Privilege escalation when viewed by administrators
Full administrator account takeover
Full account takeover across all roles
Session hijacking
CSRF token theft
Complete compromise of the entire application

This vulnerability is highly severe due to: - Persistent storage
- Global rendering surface
- Automatic execution without user interaction
- High likelihood of administrator exposure

Endpoints: - /backend/methods/
- /backend/methods/create

Steps To Reproduce (POC)

Navigate to Methods Management → Create Method
Insert the following payload into Page Name (or any vulnerable field):
<img src=x onerror=alert(document.domain)>
Save the method
Navigate to any backend page
Observe the payload executing automatically wherever the malicious method appears in the menu
The XSS triggers across all pages where the navigation is rendered.

Remediation

Never use .html(), innerHTML, or equivalent unsafe DOM sinks with untrusted data
Implement strict output encoding (HTML entity encoding) before rendering user input
Apply server-side input validation and sanitization
Use contextual escaping depending on rendering context (HTML, attribute, JS, URL)
Implement a strong Content Security Policy (CSP)
Set cookies with HttpOnly, Secure, and SameSite flags
Perform security review of all navigation rendering logic

Failure to properly encode and sanitize user-controlled method fields results in full application compromise through persistent global XSS.

Ready Video POC:

https://mega.nz/file/CFsiQAJS#cBSF2lCMD7YNZEKYEjw3T8YturY92oBvrdRQ08gmw2A

Severity ?

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.28.6.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "ci4-cms-erp/ci4ms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.31.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34558"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T00:09:24Z",
    "nvd_published_at": "2026-03-30T21:17:10Z",
    "severity": "CRITICAL"
  },
  "details": "## Summary  \n### **Vulnerability: Stored DOM XSS via Methods Management Fields (Global Persistent Payload Execution)**  \n- Stored Cross-Site Scripting via Unsanitized Method Creation and Management Inputs  \n- Automatic Execution Across All Pages Where Method Is Rendered in Navigation  \n\n## Description  \nThe application fails to properly sanitize user-controlled input within the **Methods Management** functionality when creating or managing application methods/pages. Multiple input fields accept attacker-controlled JavaScript payloads that are stored server-side without sanitization or output encoding.\n\nThese stored values are later rendered directly into administrative interfaces and global navigation components without proper encoding, resulting in **Stored DOM-Based Cross-Site Scripting (XSS)**.\n\nCritically, because created methods are automatically rendered inside the system\u2019s navigation/menu structure, the injected payload executes globally \u2014 meaning **every page visited where the malicious method appears in the menu triggers the XSS payload automatically**.\n\nThis significantly increases severity, as exploitation is not limited to a single view \u2014 it becomes a platform-wide persistent execution point.\n\n## Affected Functionality  \n- Methods creation functionality  \n- Methods management and listing functionality  \n- Administrative navigation rendering  \n- Permission-related UI rendering  \n- Global sidebar / menu rendering  \n- Storage and retrieval of method-related data  \n\n## Affected Fields  \nThe following fields accept unsanitized input and allow persistent JavaScript injection:\n- Page Name  \n- Description  \n- Controller  \n- Method Name  \n- Seflink  \n- Page Order  \n- Symbol (FontAwesome 5)  \n- Permissions  \n- Parent Page  \n- Module  \n\n## Attack Scenario  \n1. An attacker creates or edits a method.\n2. The attacker injects a malicious XSS payload into any vulnerable field (e.g., Page Name).\n3. The application stores the payload without sanitization or encoding.\n4. The method is automatically rendered inside the application\u2019s navigation/menu.\n5. Every time any user visits any page where the menu is displayed, the malicious JavaScript executes automatically.\n\nBecause the navigation is globally rendered across backend pages, the XSS triggers on nearly every administrative page visit.\n\n## Impact  \n- Persistent Stored DOM XSS  \n- Automatic execution across multiple application pages  \n- Execution of arbitrary JavaScript in victims\u2019 browsers  \n- Privilege escalation when viewed by administrators  \n- Full administrator account takeover  \n- Full account takeover across all roles  \n- Session hijacking  \n- CSRF token theft  \n- Complete compromise of the entire application  \n\nThis vulnerability is highly severe due to:\n- Persistent storage  \n- Global rendering surface  \n- Automatic execution without user interaction  \n- High likelihood of administrator exposure  \n\nEndpoints:\n- `/backend/methods/`  \n- `/backend/methods/create`  \n\n## Steps To Reproduce (POC)  \n1. Navigate to Methods Management \u2192 Create Method  \n2. Insert the following payload into Page Name (or any vulnerable field):  \n`\u003cimg src=x onerror=alert(document.domain)\u003e`  \n3. Save the method  \n4. Navigate to any backend page  \n5. Observe the payload executing automatically wherever the malicious method appears in the menu  \n6. The XSS triggers across all pages where the navigation is rendered.\n\n## Remediation  \n- Never use `.html()`, `innerHTML`, or equivalent unsafe DOM sinks with untrusted data  \n- Implement strict output encoding (HTML entity encoding) before rendering user input  \n- Apply server-side input validation and sanitization  \n- Use contextual escaping depending on rendering context (HTML, attribute, JS, URL)  \n- Implement a strong Content Security Policy (CSP)  \n- Set cookies with HttpOnly, Secure, and SameSite flags  \n- Perform security review of all navigation rendering logic  \n\nFailure to properly encode and sanitize user-controlled method fields results in full application compromise through persistent global XSS.\n\n# Ready Video POC:\nhttps://mega.nz/file/CFsiQAJS#cBSF2lCMD7YNZEKYEjw3T8YturY92oBvrdRQ08gmw2A",
  "id": "GHSA-v77r-xg3p-75g7",
  "modified": "2026-04-01T00:09:24Z",
  "published": "2026-04-01T00:09:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-v77r-xg3p-75g7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34558"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ci4-cms-erp/ci4ms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CI4MS: Methods Management Full Account Takeover for All-Roles \u0026 Privilege-Escalation via Stored DOM XSS"
}

FKIE_CVE-2026-34558

Vulnerability from fkie_nvd - Published: 2026-03-30 21:17 - Updated: 2026-04-06 16:10

Severity ?

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
9.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-v77r-xg3p-75g7	Exploit, Vendor Advisory, Mitigation

Impacted products

	Vendor	Product	Version
	ci4-cms-erp	ci4ms	*

JSON

To clipboard

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      "nodes": [
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    },
    {
      "lang": "es",
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    }
  ],
  "id": "CVE-2026-34558",
  "lastModified": "2026-04-06T16:10:04.077",
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        "impactScore": 5.3,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 6.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-30T21:17:10.493",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory",
        "Mitigation"
      ],
      "url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-v77r-xg3p-75g7"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-34558 (GCVE-0-2026-34558)

GHSA-V77R-XG3P-75G7

Summary

Vulnerability: Stored DOM XSS via Methods Management Fields (Global Persistent Payload Execution)

Description

Affected Functionality

Affected Fields

Attack Scenario

Impact

Steps To Reproduce (POC)

Remediation

Ready Video POC:

FKIE_CVE-2026-34558

Tags

Sightings

Nomenclature