Vulnerability-Lookup

CVE-2026-54416 (GCVE-0-2026-54416)

Vulnerability from cvelistv5 – Published: 2026-08-05 06:58 – Updated: 2026-08-05 13:31

Title

Pluck CMS: Unrestricted File Upload via Missing .php8 Extension in Upload Blacklist

Summary

Pluck CMS through 4.7.21 restricts dangerous file uploads in its admin file-management feature using a fixed blacklist in data/inc/files.php ('.php','php3','php4','php5','php6','php7','phtml','.phtm','.pht','.ph3','.ph4','.ph5','.asp','.cgi','.phar'), checked against the last 4-5 characters of the filename. The blacklist omits the '.php8' extension. An authenticated administrator can upload a file named e.g. shell.php8, which is stored unmodified and, on servers running PHP 8.x, is executed as PHP by the web server, resulting in remote code execution.

Severity

7.2 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

TuranSec

References

1 reference

URL	Tags
https://github.com/pluck-cms/pluck

Impacted products

1 product

Vendor	Product	Version
pluck-cms	Pluck CMS	Affected: 0 , ≤ 4.7.21 (custom)

Credits

Alijonov Alisher

Show details on NVD website

JSON

To clipboard

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                "timestamp": "2026-08-05T13:26:25.540119Z",
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          "programFiles": [
            "data/inc/files.php"
          ],
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          "versions": [
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              "lessThanOrEqual": "4.7.21",
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      "descriptions": [
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          "lang": "en",
          "value": "Pluck CMS through 4.7.21 restricts dangerous file uploads in its admin file-management feature using a fixed blacklist in data/inc/files.php (\u0027.php\u0027,\u0027php3\u0027,\u0027php4\u0027,\u0027php5\u0027,\u0027php6\u0027,\u0027php7\u0027,\u0027phtml\u0027,\u0027.phtm\u0027,\u0027.pht\u0027,\u0027.ph3\u0027,\u0027.ph4\u0027,\u0027.ph5\u0027,\u0027.asp\u0027,\u0027.cgi\u0027,\u0027.phar\u0027), checked against the last 4-5 characters of the filename. The blacklist omits the \u0027.php8\u0027 extension. An authenticated administrator can upload a file named e.g. shell.php8, which is stored unmodified and, on servers running PHP 8.x, is executed as PHP by the web server, resulting in remote code execution."
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    "dateReserved": "2026-06-13T16:39:46.122Z",
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}

GHSA-FVWX-9QCR-CRPH

Vulnerability from github – Published: 2026-08-05 09:31 – Updated: 2026-08-05 09:31

Details

Severity

7.2 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-54416"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T08:16:33Z",
    "severity": "HIGH"
  },
  "details": "Pluck CMS through 4.7.21 restricts dangerous file uploads in its admin file-management feature using a fixed blacklist in data/inc/files.php (\u0027.php\u0027,\u0027php3\u0027,\u0027php4\u0027,\u0027php5\u0027,\u0027php6\u0027,\u0027php7\u0027,\u0027phtml\u0027,\u0027.phtm\u0027,\u0027.pht\u0027,\u0027.ph3\u0027,\u0027.ph4\u0027,\u0027.ph5\u0027,\u0027.asp\u0027,\u0027.cgi\u0027,\u0027.phar\u0027), checked against the last 4-5 characters of the filename. The blacklist omits the \u0027.php8\u0027 extension. An authenticated administrator can upload a file named e.g. shell.php8, which is stored unmodified and, on servers running PHP 8.x, is executed as PHP by the web server, resulting in remote code execution.",
  "id": "GHSA-fvwx-9qcr-crph",
  "modified": "2026-08-05T09:31:16Z",
  "published": "2026-08-05T09:31:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54416"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pluck-cms/pluck"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "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.

Action not permitted

CVE-2026-54416 (GCVE-0-2026-54416)

GHSA-FVWX-9QCR-CRPH

Tags

Sightings

Nomenclature