Vulnerability-Lookup

CVE-2026-16621 (GCVE-0-2026-16621)

Vulnerability from cvelistv5 – Published: 2026-08-12 11:23 – Updated: 2026-08-12 12:14

Title

Payment Gateway for PayPal on WooCommerce < 9.2.1 - Unauthenticated Payment Bypass via PayPal Advanced Return Handler

Summary

The Payment Gateway for PayPal on WooCommerce WordPress plugin before 9.2.1 does not verify that payment actually succeeded before completing an order in its PayPal return handler: it reads attacker-controlled parameters, performs no amount comparison and no order-ownership check, and completes the order even when the server-side gateway verification fails, allowing an unauthenticated attacker to mark arbitrary orders as paid without paying.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-12 12:14 UTC

CWE

CWE-345 Insufficient Verification of Data Authenticity

Assigner

WPScan

References

1 reference

URL	Tags
https://wpscan.com/vulnerability/76c4cff2-1166-45…	exploitvdb-entrytechnical-description

Impacted products

1 product

Vendor	Product	Version
Unknown	Payment Gateway for PayPal on WooCommerce	Affected: 0 , < 9.2.1 (semver)

Credits

Muni Nitish Kumar Yaddala WPScan

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-16621

Vulnerability from fkie_nvd - Published: 2026-08-12 12:17 - Updated: 2026-08-12 13:17

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	contact@wpscan.com	https://wpscan.com/vulnerability/76c4cff2-1166-45fe-9517-5eda2d24c35d/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://wordpress.org/plugins",
          "defaultStatus": "unaffected",
          "product": "Payment Gateway for PayPal on WooCommerce",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThan": "9.2.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "contact@wpscan.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Payment Gateway for PayPal on WooCommerce WordPress plugin before 9.2.1 does not verify that payment actually succeeded before completing an order in its PayPal return handler: it reads attacker-controlled parameters, performs no amount comparison and no order-ownership check, and completes the order even when the server-side gateway verification fails, allowing an unauthenticated attacker to mark arbitrary orders as paid without paying."
    }
  ],
  "id": "CVE-2026-16621",
  "lastModified": "2026-08-12T13:17:19.760",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "contact@wpscan.com",
        "type": "Secondary"
      }
    ],
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  "references": [
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      "source": "contact@wpscan.com",
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}

GHSA-G8F7-GP6H-9F2X

Vulnerability from github – Published: 2026-08-12 12:32 – Updated: 2026-08-12 12:32

Details

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-16621"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-12T12:17:46Z",
    "severity": "MODERATE"
  },
  "details": "The Payment Gateway for PayPal on WooCommerce WordPress plugin before 9.2.1 does not verify that payment actually succeeded before completing an order in its PayPal return handler: it reads attacker-controlled parameters, performs no amount comparison and no order-ownership check, and completes the order even when the server-side gateway verification fails, allowing an unauthenticated attacker to mark arbitrary orders as paid without paying.",
  "id": "GHSA-g8f7-gp6h-9f2x",
  "modified": "2026-08-12T12:32:54Z",
  "published": "2026-08-12T12:32:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16621"
    },
    {
      "type": "WEB",
      "url": "https://wpscan.com/vulnerability/76c4cff2-1166-45fe-9517-5eda2d24c35d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-16621 (GCVE-0-2026-16621)

FKIE_CVE-2026-16621

GHSA-G8F7-GP6H-9F2X

Tags

Sightings

Nomenclature