{
"document": {
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE"
}
},
"lang": "en",
"notes": [
{
"category": "legal_disclaimer",
"text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
}
],
"publisher": {
"category": "coordinator",
"contact_details": "cert@ncsc.nl",
"name": "National Cyber Security Centre",
"namespace": "https://www.ncsc.nl/"
},
"title": "CVE-2026-34396",
"tracking": {
"current_release_date": "2026-04-01T23:33:15.712498Z",
"generator": {
"date": "2026-02-17T15:00:00Z",
"engine": {
"name": "V.E.L.M.A",
"version": "1.7"
}
},
"id": "CVE-2026-34396",
"initial_release_date": "2026-03-31T21:26:17.579655Z",
"revision_history": [
{
"date": "2026-03-31T21:26:17.579655Z",
"number": "1",
"summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)."
},
{
"date": "2026-03-31T21:26:19.697704Z",
"number": "2",
"summary": "NCSC Score created."
},
{
"date": "2026-03-31T21:39:10.305920Z",
"number": "3",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)."
},
{
"date": "2026-03-31T21:39:12.554637Z",
"number": "4",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-31T23:58:22.161255Z",
"number": "5",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)."
},
{
"date": "2026-03-31T23:58:25.411883Z",
"number": "6",
"summary": "NCSC Score updated."
},
{
"date": "2026-04-01T15:06:43.286873Z",
"number": "7",
"summary": "Source connected.| CVE status created. (valid)| EPSS created."
},
{
"date": "2026-04-01T15:07:55.448579Z",
"number": "8",
"summary": "NCSC Score updated."
},
{
"date": "2026-04-01T23:00:50.915191Z",
"number": "9",
"summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)."
},
{
"date": "2026-04-01T23:00:53.118955Z",
"number": "10",
"summary": "NCSC Score updated."
}
],
"status": "interim",
"version": "10"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/<=26.0",
"product": {
"name": "vers:unknown/<=26.0",
"product_id": "CSAFPID-5893889",
"product_identification_helper": {
"cpe": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*"
}
}
}
],
"category": "product_name",
"name": "AVideo"
}
],
"category": "vendor",
"name": "WWBN"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-34396",
"cwe": {
"id": "CWE-79",
"name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
},
"notes": [
{
"category": "description",
"text": "WWBN AVideo is an open source video platform. In versions 26.0 and prior, the AVideo admin panel renders plugin configuration values in HTML forms without applying htmlspecialchars() or any other output encoding. The jsonToFormElements() function in admin/functions.php directly interpolates user-controlled values into textarea contents, option elements, and input attributes. An attacker who can set a plugin configuration value (either as a compromised admin or by chaining with CSRF on admin/save.json.php) can inject arbitrary JavaScript that executes whenever any administrator visits the plugin configuration page. At time of publication, there are no publicly available patches.",
"title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34396"
},
{
"category": "description",
"text": "WWBN AVideo is an open source video platform. In versions 26.0 and prior, the AVideo admin panel renders plugin configuration values in HTML forms without applying htmlspecialchars() or any other output encoding. The jsonToFormElements() function in admin/functions.php directly interpolates user-controlled values into textarea contents, option elements, and input attributes. An attacker who can set a plugin configuration value (either as a compromised admin or by chaining with CSRF on admin/save.json.php) can inject arbitrary JavaScript that executes whenever any administrator visits the plugin configuration page. At time of publication, there are no publicly available patches.",
"title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34396.json"
},
{
"category": "description",
"text": "## Summary\n\nThe AVideo admin panel renders plugin configuration values in HTML forms without applying `htmlspecialchars()` or any other output encoding. The `jsonToFormElements()` function in `admin/functions.php` directly interpolates user-controlled values into textarea contents, option elements, and input attributes. An attacker who can set a plugin configuration value (either as a compromised admin or by chaining with CSRF on `admin/save.json.php`) can inject arbitrary JavaScript that executes whenever any administrator visits the plugin configuration page.\n\nThis vulnerability chains with AVI-046 (CSRF on `save.json.php`) to enable a full cross-origin stored XSS attack against the admin panel without requiring any prior authentication.\n\n## Details\n\nThe `jsonToFormElements()` function in `admin/functions.php` contains multiple unsafe output points where configuration values are rendered without escaping:\n\n**Textarea injection (line 47):**\n```php\n// admin/functions.php:47\n$html .= \"\";\n```\nThe `$valueJson->value` is placed directly between textarea tags without encoding.\n\n**Select option injection (line 55):**\n```php\n// admin/functions.php:55\n$html .= \"\";\n```\nBoth `$key` and `$value` are inserted without encoding, allowing attribute breakout and HTML injection.\n\n**Input type and value injection (lines 62-63):**\n```php\n// admin/functions.php:62-63\n$html .= \"\";\n```\nBoth `type` and `value` attributes are unescaped, enabling attribute injection.\n\n**Fallback input injection (line 75):**\n```php\n// admin/functions.php:75\n$html .= \"\";\n```\nThe raw `$valueJson` string is placed into the `value` attribute without encoding.\n\nConfiguration values are saved via `admin/save.json.php`, which lacks CSRF token validation.\n\n## Proof of Concept\n\n**Method 1: Direct exploitation (requires admin session)**\n\n```bash\n# Store XSS payload in a plugin configuration value\n# The endpoint uses pluginName and direct field names as parameters\ncurl -b \"PHPSESSID=ADMIN_SESSION_COOKIE\" \\\n -X POST \"https://your-avideo-instance.com/admin/save.json.php\" \\\n -d \"pluginName=PlayerSkins&skin=x' onfocus=alert(document.cookie) autofocus='\"\n```\n\nWhen any admin visits the plugin configuration page, the payload fires.\n\n**Method 2: Cross-origin chain with CSRF (no authentication required)**\n\nCreate the following HTML page and trick an admin into visiting it:\n\n```html\n\n\nAVI-033 + AVI-046 Chain PoC\n\n