CVE-2026-25509: Ci4 cms erp/ci4ms CI4MS Vulnerable To User Email Vulnerability

MODERATE
Advisory Identifier: GHSA-654x-9q7r-g966
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CVSS 5.3
CWE-204 CWE-203
Published
Advisory Summary

CVE-2026-25509 is a MODERATE (CVSS 5.3) ci4ms vulnerable to user email vulnerability (CWE-204: Observable Response Discrepancy) affecting Ci4 cms erp/ci4ms libraries in the Packagist ecosystem. The issue involves ci4ms vulnerable to user email enumeration via password reset flow. Remediation is available by upgrading affected packages to version 0.28.5.0.

CVE-2026-25509 at a Glance

CVE Identifier CVE-2026-25509
GHSA Identifier GHSA-654x-9q7r-g966
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-204: Observable Response Discrepancy
Affected Product Ci4 cms erp/ci4ms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-25509

To remediate this vulnerability, upgrade all affected Ci4 cms erp/ci4ms dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

ci4-cms-erp/ci4ms fixed: 0.28.5.0 
Upgrade ci4-cms-erp/ci4ms to 0.28.5.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for ci4-cms-erp/ci4ms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-25509, inspect your project dependencies for Ci4 cms erp/ci4ms:

inspect dependencies for ci4-cms-erp/ci4ms

Analyze the terminal output to locate any version of Ci4 cms erp/ci4ms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.28.5.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-204: Observable Response Discrepancy, where the product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere. In Ci4 cms erp/ci4ms, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

**Summary** The authentication implementation in CI4MS is vulnerable to email enumeration. An unauthenticated attacker can determine whether an email address is registered in the system by analyzing the application's response during the password reset process. **Vulnerability Details** - The password reset flow returns different responses based on whether the provided email address exists in the database or not. - If the email is registered, the system typically returns a success message (e.g., "Password reset link has been sent"). If the email is not registered, the system returns an error message (e.g., "User not found" or a different HTTP status code). This discrepancy allows attackers to programmatically "enumerate" or confirm valid user emails, which can then be used for targeted phishing attacks or brute-force attempts. **Steps to Reproduce** 1. Navigate to the password reset page of the CI4MS installation. 2. Enter an email address that you know is not registered (e.g., nonexistent@example.com) and submit. Note the response message/code. 3. Enter an email address that is registered (e.g., an admin or test account) and submit. Note the different response. 4. The difference between these two responses confirms the enumeration vulnerability. **Suggested Mitigation** Implement a uniform, generic response for all password reset requests, regardless of whether the email exists. Recommended message: "If an account is associated with this email address, a password reset link has been sent."

CVE-2026-25509 Affected Ci4 cms erp/ci4ms Versions

1 component(s)
Fixed Versions:
0.28.5.0
Product / Package Ecosystem Affected Versions Fixed Version
ci4-cms-erp/ci4ms
 Packagist
< 0.28.5.0
0.28.5.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-654x-9q7r-g966
NVD — CVE-2026-25509 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25509
Security Fix Commit FIX COMMIT
https://github.com/ci4-cms-erp/ci4ms/commit/86be2930d1c54eb7575102563302b2f3bafcb653
Ci4 cms erp/ci4ms Source Repository REPOSITORY
https://github.com/ci4-cms-erp/ci4ms

Frequently Asked Questions

What is CVE-2026-25509?
CVE-2026-25509 is a security vulnerability in Ci4 cms erp/ci4ms involving CI4MS Vulnerable to User Email Enumeration via Password Reset Flow under CWE-204: Observable Response Discrepancy.
Which Ci4 cms erp/ci4ms versions are affected?
Affected versions include releases prior to 0.28.5.0 across affected packages: ci4-cms-erp/ci4ms.
What version fixes CVE-2026-25509?
Upgrading to 0.28.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ci4-cms-erp/ci4ms affected?
Yes, ci4-cms-erp/ci4ms is affected in releases prior to 0.28.5.0. Upgrade your dependency to 0.28.5.0 or later.
What is the CVSS score of CVE-2026-25509?
CVE-2026-25509 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-25509?
CVE-2026-25509 is classified under CWE-204: Observable Response Discrepancy (The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.).
How can I check Packagist dependencies for CVE-2026-25509?
Run the dependency tree command: 'inspect dependencies for ci4-cms-erp/ci4ms'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-654x-9q7r-g966",
  "modified" : "2026-02-11T14:14:07Z",
  "published" : "2026-02-02T21:52:06Z",
  "aliases" : [ "CVE-2026-25509" ],
  "summary" : "CI4MS Vulnerable to User Email Enumeration via Password Reset Flow",
  "details" : "**Summary**\n\nThe authentication implementation in CI4MS is vulnerable to email enumeration. An unauthenticated attacker can determine whether an email address is registered in the system by analyzing the application's response during the password reset process.\n\n**Vulnerability Details**\n\n- The password reset flow returns different responses based on whether the provided email address exists in the database or not.\n- If the email is registered, the system typically returns a success message (e.g., \"Password reset link has been sent\").\n\nIf the email is not registered, the system returns an error message (e.g., \"User not found\" or a different HTTP status code).\n\nThis discrepancy allows attackers to programmatically \"enumerate\" or confirm valid user emails, which can then be used for targeted phishing attacks or brute-force attempts.\n\n**Steps to Reproduce**\n\n1. Navigate to the password reset page of the CI4MS installation.\n2. Enter an email address that you know is not registered (e.g., nonexistent@example.com) and submit. Note the response message/code.\n3. Enter an email address that is registered (e.g., an admin or test account) and submit. Note the different response.\n4. The difference between these two responses confirms the enumeration vulnerability.\n\n**Suggested Mitigation**\n\nImplement a uniform, generic response for all password reset requests, regardless of whether the email exists. Recommended message: \"If an account is associated with this email address, a password reset link has been sent.\"",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "ci4-cms-erp/ci4ms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.28.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-654x-9q7r-g966"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-25509"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ci4-cms-erp/ci4ms/commit/86be2930d1c54eb7575102563302b2f3bafcb653"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ci4-cms-erp/ci4ms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-203", "CWE-204" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-02T21:52:06Z",
    "nvd_published_at" : "2026-02-03T22:16:31Z"
  }
}