CVE-2026-44583: Paymenter/paymenter Paymenter Has Blind Unauthenticated SSRF Vulnerability

MODERATE
Advisory Identifier: GHSA-7wwh-xcc3-9fcg
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CVSS 5.3
CWE-918
Published
Advisory Summary

CVE-2026-44583 is a MODERATE (CVSS 5.3) paymenter has blind unauthenticated ssrf vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Paymenter/paymenter libraries in the Packagist ecosystem. The issue involves paymenter has blind unauthenticated ssrf on the paypal gateway module. Remediation is available by upgrading affected packages to version 1.5.0.

CVE-2026-44583 at a Glance

CVE Identifier CVE-2026-44583
GHSA Identifier GHSA-7wwh-xcc3-9fcg
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Paymenter/paymenter
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-2026-44583

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

paymenter/paymenter fixed: 1.5.0 
Upgrade paymenter/paymenter to 1.5.0
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 paymenter/paymenter

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-44583, inspect your project dependencies for Paymenter/paymenter:

inspect dependencies for paymenter/paymenter

Analyze the terminal output to locate any version of Paymenter/paymenter in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.5.0), 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Paymenter/paymenter, 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 PayPal webhook endpoint `/extensions/paypal/webhook` processes the `PAYPAL-CERT-URL` HTTP header without validation, allowing attackers to control server-side HTTP request destinations. ### Technical details: The `/extensions/paypal/webhook` endpoint processes incoming webhook requests and trusts the value of the `PAYPAL-CERT-URL` HTTP header without validation. This value is passed directly into a server-side HTTP request via `file_get_contents`, allowing attackers to control the destination of the request. No allowlist, validation, or signature verification is applied to the header before usage. As a result, the application can be coerced into performing HTTP requests to attacker-controlled or internal network destinations. ### Impact This vulnerability allows remote unauthenticated attackers to induce server-side HTTP GET requests to arbitrary external or internal endpoints. Depending on network configuration, this may lead to: - Blind SSRF to external attacker-controlled systems - Potential access to internal network services No direct response data is returned to the attacker (blind SSRF), but the issue may still enable sensitive network probing or data exfiltration via side channels.

CVE-2026-44583 Affected Paymenter/paymenter Versions

1 component(s)
Fixed Versions:
1.5.0
Product / Package Ecosystem Affected Versions Fixed Version
paymenter/paymenter
 Packagist
< 1.5.0
1.5.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/Paymenter/Paymenter/security/advisories/GHSA-7wwh-xcc3-9fcg
Paymenter/paymenter Source Repository REPOSITORY
https://github.com/Paymenter/Paymenter

Frequently Asked Questions

What is CVE-2026-44583?
CVE-2026-44583 is a security vulnerability in Paymenter/paymenter involving Paymenter has Blind Unauthenticated SSRF on the Paypal gateway module under CWE-918: Server-Side Request Forgery (SSRF).
Which Paymenter/paymenter versions are affected?
Affected versions include releases prior to 1.5.0 across affected packages: paymenter/paymenter.
What version fixes CVE-2026-44583?
Upgrading to 1.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is paymenter/paymenter affected?
Yes, paymenter/paymenter is affected in releases prior to 1.5.0. Upgrade your dependency to 1.5.0 or later.
What is the CVSS score of CVE-2026-44583?
CVE-2026-44583 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-2026-44583?
CVE-2026-44583 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Packagist dependencies for CVE-2026-44583?
Run the dependency tree command: 'inspect dependencies for paymenter/paymenter'. 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-7wwh-xcc3-9fcg",
  "modified" : "2026-06-22T20:28:29Z",
  "published" : "2026-06-22T20:28:29Z",
  "aliases" : [ "CVE-2026-44583" ],
  "summary" : "Paymenter has Blind Unauthenticated SSRF on the Paypal gateway module",
  "details" : "### Summary\nThe PayPal webhook endpoint `/extensions/paypal/webhook` processes the `PAYPAL-CERT-URL` HTTP header without validation, allowing attackers to control server-side HTTP request destinations.\n\n### Technical details:\n\nThe `/extensions/paypal/webhook` endpoint processes incoming webhook requests and trusts the value of the `PAYPAL-CERT-URL` HTTP header without validation.\n\nThis value is passed directly into a server-side HTTP request via `file_get_contents`, allowing attackers to control the destination of the request. No allowlist, validation, or signature verification is applied to the header before usage.\n\nAs a result, the application can be coerced into performing HTTP requests to attacker-controlled or internal network destinations.\n\n### Impact\nThis vulnerability allows remote unauthenticated attackers to induce server-side HTTP GET requests to arbitrary external or internal endpoints.\n\nDepending on network configuration, this may lead to:\n\n- Blind SSRF to external attacker-controlled systems\n- Potential access to internal network services\n\nNo direct response data is returned to the attacker (blind SSRF), but the issue may still enable sensitive network probing or data exfiltration via side channels.",
  "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" : "paymenter/paymenter"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/Paymenter/Paymenter/security/advisories/GHSA-7wwh-xcc3-9fcg"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Paymenter/Paymenter"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-22T20:28:29Z",
    "nvd_published_at" : null
  }
}