Vulnerability-Lookup

GHSA-4HJJ-956W-4CWM

Vulnerability from github – Published: 2026-05-20 09:30 – Updated: 2026-05-20 09:30

Details

The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the image deletion REST flow where the permission callback for DELETE /imagely/v1/images/{id} only checks 'NextGEN Manage gallery' permissions and does not enforce gallery ownership or 'NextGEN Manage others gallery' permissions. This makes it possible for authenticated attackers, with Subscriber-level privileges and 'NextGEN Manage gallery' capability, to delete gallery images belonging to other users as well as their associated image files from disk when deleteImg is enabled (default).

Severity

4.3 (Medium)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-6566"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-20T07:16:16Z",
    "severity": "MODERATE"
  },
  "details": "The Photo Gallery, Sliders, Proofing and Themes \u2013 NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the image deletion REST flow where the permission callback for DELETE /imagely/v1/images/{id} only checks \u0027NextGEN Manage gallery\u0027 permissions and does not enforce gallery ownership or \u0027NextGEN Manage others gallery\u0027 permissions. This makes it possible for authenticated attackers, with Subscriber-level privileges and \u0027NextGEN Manage gallery\u0027 capability, to delete gallery images belonging to other users as well as their associated image files from disk when deleteImg is enabled (default).",
  "id": "GHSA-4hjj-956w-4cwm",
  "modified": "2026-05-20T09:30:34Z",
  "published": "2026-05-20T09:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6566"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset/3533432/nextgen-gallery"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/439809ad-21ea-4a0b-b1fd-5de9f8f5ee7a?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:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-6566 (GCVE-0-2026-6566)

Vulnerability from cvelistv5 – Published: 2026-05-20 05:31 – Updated: 2026-05-20 15:54

Title

Photo Gallery, Sliders, Proofing and Themes <= 4.2.0 - Insecure Direct Object Reference to Authenticated (Subscriber+) Image Deletion via REST API

Summary

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-20 15:43 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

Wordfence mitre root

References

2 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/changeset/3533…

Impacted products

1 product

Vendor	Product	Version
smub	Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery	Affected: 0 , ≤ 4.2.0 (semver)

Credits

Bao Luu Gia Nguyen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-6566",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-20T15:43:36.099126Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-20T15:54:05.752Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Photo Gallery, Sliders, Proofing and Themes \u2013 NextGEN Gallery",
          "vendor": "smub",
          "versions": [
            {
              "lessThanOrEqual": "4.2.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Bao Luu Gia Nguyen"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Photo Gallery, Sliders, Proofing and Themes \u2013 NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the image deletion REST flow where the permission callback for DELETE /imagely/v1/images/{id} only checks \u0027NextGEN Manage gallery\u0027 permissions and does not enforce gallery ownership or \u0027NextGEN Manage others gallery\u0027 permissions. This makes it possible for authenticated attackers, with Subscriber-level privileges and \u0027NextGEN Manage gallery\u0027 capability, to delete gallery images belonging to other users as well as their associated image files from disk when deleteImg is enabled (default)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
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        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
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          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/439809ad-21ea-4a0b-b1fd-5de9f8f5ee7a?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset/3533432/nextgen-gallery"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-04-18T20:42:58.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-05-19T17:01:55.000Z",
          "value": "Disclosed"
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    "datePublished": "2026-05-20T05:31:10.536Z",
    "dateReserved": "2026-04-18T17:51:56.808Z",
    "dateUpdated": "2026-05-20T15:54:05.752Z",
    "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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Action not permitted

GHSA-4HJJ-956W-4CWM

CVE-2026-6566 (GCVE-0-2026-6566)

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