CVE-2026-100820 (GCVE-0-2026-100820)
Vulnerability from cvelistv5
Published
2026-09-29 12:36
Modified
2026-09-30 17:20
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
Privilege escalation in the Address Bar component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
References
Impacted products
Vendor Product Version
Mozilla Thunderbird Unaffected: 140.17
Unaffected: 153.4
Unaffected: 157
 Create a notification for this product.
   Mozilla Firefox Unaffected: 140.17
Unaffected: 153.4
Unaffected: 157
 Create a notification for this product.
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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-100820",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-29T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-269",
                "description": "CWE-269 Improper Privilege Management",
                "lang": "en",
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              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-30T03:56:10.175Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "140.*",
              "status": "unaffected",
              "version": "140.17",
              "versionType": "rpm"
            },
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              "version": "153.4",
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            },
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "157",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Tran Quac"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Privilege escalation in the Address Bar component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17."
            }
          ],
          "value": "Privilege escalation in the Address Bar component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-30T17:20:49.107Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2071645"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
        }
      ],
      "title": "Privilege escalation in the Address Bar component"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-100820",
    "datePublished": "2026-09-29T12:36:29.773Z",
    "dateReserved": "2026-09-26T19:18:33.069Z",
    "dateUpdated": "2026-09-30T17:20:49.107Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
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}


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