Vulnerability-Lookup

GHSA-MW4C-2XG7-R9H8

Vulnerability from github – Published: 2026-09-11 06:31 – Updated: 2026-09-11 06:31

Details

The UsersWP plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 1.2.70 via the upload_file_remove() AJAX handler. The plugin stores the value of an account 'file' form field taken directly from $_POST when no real $_FILES upload is provided (process_account() calls uwp_validate_fields() and array_merges the result with the empty output of UsersWP_Files::validate_uploads()). At storage time the value is only checked with validate_file(), which passes any string that does not contain a literal '../'. When the value is later processed by upload_file_remove(), it is again gated with validate_file() and then normalized through uwp_get_file_relative_url(); that helper performs a global str_replace() of the uploads base URL against the stored URL, allowing a crafted URL containing embedded '..' tokens to collapse into '../../' traversal sequences after the last validation. The transformed value is then appended to the uploads base directory and passed to wp_delete_file() without any canonical containment check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the affected site's server (including wp-config.

Severity

8.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-19991"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T04:17:34Z",
    "severity": "HIGH"
  },
  "details": "The UsersWP plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 1.2.70 via the upload_file_remove() AJAX handler. The plugin stores the value of an account \u0027file\u0027 form field taken directly from $_POST when no real $_FILES upload is provided (process_account() calls uwp_validate_fields() and array_merges the result with the empty output of UsersWP_Files::validate_uploads()). At storage time the value is only checked with validate_file(), which passes any string that does not contain a literal \u0027../\u0027. When the value is later processed by upload_file_remove(), it is again gated with validate_file() and then normalized through uwp_get_file_relative_url(); that helper performs a global str_replace() of the uploads base URL against the stored URL, allowing a crafted URL containing embedded \u0027..\u003cuploads-baseurl\u003e\u0027 tokens to collapse into \u0027../../\u0027 traversal sequences after the last validation. The transformed value is then appended to the uploads base directory and passed to wp_delete_file() without any canonical containment check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the affected site\u0027s server (including wp-config.",
  "id": "GHSA-mw4c-2xg7-r9h8",
  "modified": "2026-09-11T06:31:13Z",
  "published": "2026-09-11T06:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19991"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2076"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2420"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2432"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-validation.php#L194"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/helpers/misc.php#L2107"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026new=3650759%40userswp%2Ftrunk\u0026old=3618724%40userswp%2Ftrunk\u0026sfp_email=\u0026sfph_mail="
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/dfa094d3-e8db-4402-ad23-e161b1b6181e?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-19991 (GCVE-0-2026-19991)

Vulnerability from cvelistv5 – Published: 2026-09-11 03:39 – Updated: 2026-09-11 20:30

Title

UsersWP <= 1.2.70 - Authenticated (Subscriber+) Arbitrary File Deletion

Summary

The UsersWP plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 1.2.70 via the upload_file_remove() AJAX handler. The plugin stores the value of an account 'file' form field taken directly from $_POST when no real $_FILES upload is provided (process_account() calls uwp_validate_fields() and array_merges the result with the empty output of UsersWP_Files::validate_uploads()). At storage time the value is only checked with validate_file(), which passes any string that does not contain a literal '../'. When the value is later processed by upload_file_remove(), it is again gated with validate_file() and then normalized through uwp_get_file_relative_url(); that helper performs a global str_replace() of the uploads base URL against the stored URL, allowing a crafted URL containing embedded '..<uploads-baseurl>' tokens to collapse into '../../' traversal sequences after the last validation. The transformed value is then appended to the uploads base directory and passed to wp_delete_file() without any canonical containment check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the affected site's server (including wp-config.

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-11 16:31 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

Wordfence mitre root

References

7 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/usersw…
https://plugins.trac.wordpress.org/browser/usersw…
https://plugins.trac.wordpress.org/browser/usersw…
https://plugins.trac.wordpress.org/browser/usersw…
https://plugins.trac.wordpress.org/browser/usersw…
https://plugins.trac.wordpress.org/changeset?sfp_…

Impacted products

1 product

Vendor	Product	Version
stiofansisland	UsersWP – Front-end login form, User Registration, User Profile & Members Directory plugin for WP	Affected: 0 , ≤ 1.2.70 (semver)

Credits

daroo

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-19991",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-11T16:31:53.747796Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-11T20:30:39.441Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "UsersWP \u2013 Front-end login form, User Registration, User Profile \u0026 Members Directory plugin for WP",
          "vendor": "stiofansisland",
          "versions": [
            {
              "lessThanOrEqual": "1.2.70",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "daroo"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The UsersWP plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 1.2.70 via the upload_file_remove() AJAX handler. The plugin stores the value of an account \u0027file\u0027 form field taken directly from $_POST when no real $_FILES upload is provided (process_account() calls uwp_validate_fields() and array_merges the result with the empty output of UsersWP_Files::validate_uploads()). At storage time the value is only checked with validate_file(), which passes any string that does not contain a literal \u0027../\u0027. When the value is later processed by upload_file_remove(), it is again gated with validate_file() and then normalized through uwp_get_file_relative_url(); that helper performs a global str_replace() of the uploads base URL against the stored URL, allowing a crafted URL containing embedded \u0027..\u003cuploads-baseurl\u003e\u0027 tokens to collapse into \u0027../../\u0027 traversal sequences after the last validation. The transformed value is then appended to the uploads base directory and passed to wp_delete_file() without any canonical containment check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the affected site\u0027s server (including wp-config."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T03:39:39.185Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/dfa094d3-e8db-4402-ad23-e161b1b6181e?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2432"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/helpers/misc.php#L2107"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2420"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-validation.php#L194"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/userswp/tags/1.2.70/includes/class-forms.php#L2076"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026new=3650759%40userswp%2Ftrunk\u0026old=3618724%40userswp%2Ftrunk\u0026sfp_email=\u0026sfph_mail="
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-08-16T17:48:58.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-09-10T14:40:42.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "UsersWP \u003c= 1.2.70 - Authenticated (Subscriber+) Arbitrary File Deletion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-19991",
    "datePublished": "2026-09-11T03:39:39.185Z",
    "dateReserved": "2026-08-16T17:24:16.224Z",
    "dateUpdated": "2026-09-11T20:30:39.441Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

GHSA-MW4C-2XG7-R9H8

CVE-2026-19991 (GCVE-0-2026-19991)

Tags

Sightings

Nomenclature