GHSA-PJHR-J4C6-9F6G

Vulnerability from github – Published: 2026-09-24 03:30 – Updated: 2026-09-24 03:30
VLAI
Details

The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 5.0.3. The 5.0.3 patch introduced a wp_hash()/hash_equals() signature gate on the pt-paytium-user-data field, but left a second filter — pt_cf_checkout_meta(), registered on the pt_meta_values hook after the signed builder — that copies every $_POST['pt_form_field'][*] key verbatim into the payment meta array without any signature verification; this allows the pt-user-role value it copies to overwrite the signed path's output, after which paytium_user_data_processing() reads the persisted _pt-user-role post meta and passes it directly as the role argument to wp_insert_user(). This makes it possible for unauthenticated attackers to register a new WordPress account with the administrator role and fully take over the site. Exploitation requires submitting a payment through a publicly-exposed [paytium] shortcode form and completing the resulting payment flow, after which the attacker can seize the new administrator account via the standard lost-password flow on their supplied email address.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-18467"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-24T02:16:52Z",
    "severity": "CRITICAL"
  },
  "details": "The Paytium: Mollie payment forms \u0026 donations plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 5.0.3. The 5.0.3 patch introduced a wp_hash()/hash_equals() signature gate on the pt-paytium-user-data field, but left a second filter \u2014 pt_cf_checkout_meta(), registered on the pt_meta_values hook after the signed builder \u2014 that copies every $_POST[\u0027pt_form_field\u0027][*] key verbatim into the payment meta array without any signature verification; this allows the pt-user-role value it copies to overwrite the signed path\u0027s output, after which paytium_user_data_processing() reads the persisted _pt-user-role post meta and passes it directly as the role argument to wp_insert_user(). This makes it possible for unauthenticated attackers to register a new WordPress account with the administrator role and fully take over the site. Exploitation requires submitting a payment through a publicly-exposed [paytium] shortcode form and completing the resulting payment flow, after which the attacker can seize the new administrator account via the standard lost-password flow on their supplied email address.",
  "id": "GHSA-pjhr-j4c6-9f6g",
  "modified": "2026-09-24T03:30:27Z",
  "published": "2026-09-24T03:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18467"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/paytium/tags/5.0.3/includes/payment-functions.php#L113"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/paytium/tags/5.0.3/includes/process-payment-functions.php#L1103"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/paytium/tags/5.0.3/includes/process-payment-functions.php#L21"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/paytium/tags/5.0.3/includes/process-payment-functions.php#L696"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/paytium/tags/5.0.3/includes/user-data-functions.php#L214"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset/3678569/paytium"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/caa1a42a-6bb2-42c8-aae7-fb1c895573a8?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.