Paymenter has Blind Unauthenticated SSRF on the Paypal gateway module

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

• CVE-2026-44583: 0.41% estimated exploitation activity in the next 30 days; percentile 35.87 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 filegetcontents, 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 -…

Published by the source

22 Jun 2026, 20:28 UTC

Last modified by the source

22 Jun 2026, 20:28 UTC

Source last checked

26 Oct 2026, 14:49 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7wwh-xcc3-9fcg

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# Patch Next advisory brief: CVE-2026-44583

Advisory: Paymenter has Blind Unauthenticated SSRF on the Paypal gateway module
IDs: CVE-2026-44583, GHSA-7wwh-xcc3-9fcg
Record: https://patchnext.com/advisories/cve-2026-44583 (revision 1, source checked 26 Oct 2026, 14:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: paymenter/paymenter 1.5.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist paymenter/paymenter: affected < 1.5.0; fixed in 1.5.0

## Suggested inspection (read-only)
- Packagist paymenter/paymenter: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on paymenter/paymenter.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-7wwh-xcc3-9fcg (GitHub-reviewed advisory GHSA-7wwh-xcc3-9fcg lists affected ranges: Packagist paymenter/paymenter >=0 <1.5.0)

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