WWBN AVideo has a Path Traversal in Locale Save Endpoint that Enables Arbitrary PHP File Write to Any Web-Accessible Directory (RCE)_CVE-2026-40909

{
    "lastseen": "",
    "description": "WWBN AVideo is an open source video platform. In versions 29.0 and prior, the locale save endpoint (`locale/save.php`) constructs a file path by directly concatenating `$_POST['flag']` into the path at line 30 without any sanitization. The `$_POST['code']` parameter is then written verbatim to that path via `fwrite()` at line 40. An admin attacker (or any user who can CSRF an admin, since no CSRF token is checked and cookies use `SameSite=None`) can traverse out of the `locale/` directory and write arbitrary `.php` files to any writable location on the filesystem, achieving Remote Code Execution. Commit 57f89ffbc27d37c9d9dd727212334846e78ac21a fixes the issue.",
    "published": "2026-04-21T19:54:07.257Z",
    "modified": "2026-04-21T20:36:00.797Z",
    "type": "cve",
    "title": "WWBN AVideo has a Path Traversal in Locale Save Endpoint that Enables Arbitrary PHP File Write to Any Web-Accessible Directory (RCE)",
    "source": "GitHub_M",
    "references": "https://github.com/WWBN/AVideo/security/advisories/GHSA-6rc6-p838-686f\nhttps://github.com/WWBN/AVideo/commit/57f89ffbc27d37c9d9dd727212334846e78ac21a",
    "id": "CVE-2026-40909",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "WWBN AVideo <= 29.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "AVideo",
    "version": "<= 29.0",
    "vendor": "WWBN",
    "ai_description": "Path Traversal vulnerability in WWBN AVideo locale save endpoint, allowing arbitrary PHP file write to any web-accessible directory, resulting in Remote Code Execution",
    "ai_severity": "High",
    "ai_vendor": "WWBN",
    "ai_product": "AVideo",
    "ai_version": "<= 29.0",
    "ai_score": 8.7
}