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CVE-2022-21649

Estado: ModificadaMedia (5.4)—

Convos is an open source multi-user chat that runs in a web browser. Characters starting with "https://" in the chat window create an <a> tag. Stored XSS vulnerability using onfocus and autofocus occurs because escaping exists for "<" or ">" but escaping for double quotes does not exist. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Convos — Convos

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2022-21649",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2022-21649",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
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              "automatable": "no"
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              "technicalImpact": "partial"
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          ],
          "version": "2.0.3",
          "timestamp": "2025-04-22T15:52:23.471657Z"
        }
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    "cvssMetricV2": [
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
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        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.8,
        "obtainUserPrivilege": false,
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    "cvssMetricV31": [
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        "cvssData": {
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N",
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      "affectedData": [
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          "vendor": "convos-chat",
          "product": "convos",
          "versions": [
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              "version": ">= 6.49, < 6.52"
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  "published": "2022-01-04T21:15:07.883",
  "references": [
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    },
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-79"
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Convos is an open source multi-user chat that runs in a web browser. Characters starting with \"https://\" in the chat window create an <a> tag. Stored XSS vulnerability using onfocus and autofocus occurs because escaping exists for \"<\" or \">\" but escaping for double quotes does not exist. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible."
    },
    {
      "lang": "es",
      "value": "Convos es un chat multiusuario de código abierto que es ejecutado en un navegador web. Los caracteres que empiezan por \"https://\" en la ventana de chat crean una etiqueta (a). Una vulnerabilidad de tipo XSS almacenada que usa onfocus y autofocus se produce porque el escape se presenta para \"(\" o \")\" pero el escape para las comillas dobles no se presenta. Mediante esta vulnerabilidad, un atacante es capaz de ejecutar scripts maliciosos. Se aconseja a usuarios que actualicen lo antes posible"
    }
  ],
  "lastModified": "2026-06-17T04:26:40.980",
  "configurations": [
    {
      "nodes": [
        {
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              "versionEndExcluding": "6.52"
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          ],
          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}