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2026-03-23 18:23CVE-2026-33647GitHub_M
PUBLISHED5.2CWE-434

AVideo Vulnerable to Remote Code Execution via MIME/Extension Mismatch in ImageGallery File Upload

WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `ImageGallery::saveFile()` method validates uploaded file content using `finfo` MIME type detection but derives the saved filename extension from the user-supplied original filename without an allowlist check. An attacker can upload a polyglot file (valid JPEG magic bytes followed by PHP code) with a `.php` extension. The MIME check passes, but the file is saved as an executable `.php` file in a web-accessible directory, achieving Remote Code Execution. Commit 345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae contains a patch.

Problem type

Affected products

WWBN

AVideo

<= 26.0 - AFFECTED

References

https://github.com/WWBN/AVideo/security/advisories/GHSA-wxjw-phj6-g75w

https://github.com/WWBN/AVideo/security/advisories/GHSA-wxjw-phj6-g75w

x_refsource_CONFIRM
https://github.com/WWBN/AVideo/commit/345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae

https://github.com/WWBN/AVideo/commit/345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae

x_refsource_MISC

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-33647
Click to expand
{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-33647",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-03-23T18:23:20.079Z",
    "dateReserved": "2026-03-23T15:23:42.217Z",
    "datePublished": "2026-03-23T18:23:20.079Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-03-23T18:23:20.079Z"
      },
      "title": "AVideo Vulnerable to Remote Code Execution via MIME/Extension Mismatch in ImageGallery File Upload",
      "descriptions": [
        {
          "lang": "en",
          "value": "WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `ImageGallery::saveFile()` method validates uploaded file content using `finfo` MIME type detection but derives the saved filename extension from the user-supplied original filename without an allowlist check. An attacker can upload a polyglot file (valid JPEG magic bytes followed by PHP code) with a `.php` extension. The MIME check passes, but the file is saved as an executable `.php` file in a web-accessible directory, achieving Remote Code Execution. Commit 345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae contains a patch."
        }
      ],
      "affected": [
        {
          "vendor": "WWBN",
          "product": "AVideo",
          "versions": [
            {
              "version": "<= 26.0",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
              "cweId": "CWE-434",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-wxjw-phj6-g75w",
          "name": "https://github.com/WWBN/AVideo/security/advisories/GHSA-wxjw-phj6-g75w",
          "tags": [
            "x_refsource_CONFIRM"
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        },
        {
          "url": "https://github.com/WWBN/AVideo/commit/345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae",
          "name": "https://github.com/WWBN/AVideo/commit/345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae",
          "tags": [
            "x_refsource_MISC"
          ]
        }
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      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "LOW",
            "userInteraction": "NONE",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH"
          }
        }
      ]
    }
  }
}