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CVE-2020-6798

Status: ModifiedMedium (6.1)—

If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (3)

Mozilla — FirefoxMozilla — Firefox ESRMozilla — Thunderbird

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2020-6798",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
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      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Thunderbird",
          "versions": [
            {
              "status": "affected",
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          "product": "Firefox",
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        }
      ]
    }
  ],
  "published": "2020-03-02T05:15:13.400",
  "references": [
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1602944",
      "tags": [
        "Permissions Required"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://security.gentoo.org/glsa/202003-02",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://security.gentoo.org/glsa/202003-10",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://usn.ubuntu.com/4278-2/",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://usn.ubuntu.com/4328-1/",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://usn.ubuntu.com/4335-1/",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-05/",
      "tags": [
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      "source": "security@mozilla.org"
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    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-06/",
      "tags": [
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-07/",
      "tags": [
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      "source": "security@mozilla.org"
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      "tags": [
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://security.gentoo.org/glsa/202003-10",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://usn.ubuntu.com/4278-2/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://usn.ubuntu.com/4328-1/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-05/",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-06/",
      "tags": [
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-07/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5."
    },
    {
      "lang": "es",
      "value": "Si se usó una etiqueta template en una etiqueta select, el analizador podría ser confundido y permitir el análisis y la ejecución de JavaScript cuando no debería ser permitido. Un sitio que se basó en que el navegador se comportara correctamente podría sufrir una vulnerabilidad de tipo cross-site scripting como resultado de ello. En general, este fallo no puede ser explotado por medio del correo electrónico en el producto Thunderbird porque el scripting es deshabilitado cuando se lee el correo, pero es potencialmente un riesgo en el navegador o en contextos similares a los del navegador. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 68.5, Firefox versiones anteriores a 73, y Firefox versiones anteriores a ESR68.5."
    }
  ],
  "lastModified": "2026-06-17T03:23:49.520",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "D881BDA7-3601-4A45-991F-4B2B187A73D0",
              "versionEndExcluding": "73.0"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "17B5BB4D-FF9F-433C-A3AC-E4F34C3D75D9",
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  "sourceIdentifier": "security@mozilla.org"
}