Vulnerability-Lookup

GHSA-3QGM-JCXP-M9M6

Vulnerability from github – Published: 2026-02-24 15:30 – Updated: 2026-02-24 15:30

Details

Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, and Firefox ESR < 140.8.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-2778"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-24T14:16:26Z",
    "severity": null
  },
  "details": "Sandbox escape due to incorrect boundary conditions in the DOM: Core \u0026 HTML component. This vulnerability affects Firefox \u003c 148, Firefox ESR \u003c 115.33, and Firefox ESR \u003c 140.8.",
  "id": "GHSA-3qgm-jcxp-m9m6",
  "modified": "2026-02-24T15:30:32Z",
  "published": "2026-02-24T15:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2778"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2016358"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-13"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-14"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-15"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-2778 (GCVE-0-2026-2778)

Vulnerability from cvelistv5 – Published: 2026-02-24 13:33 – Updated: 2026-02-24 17:30

Title

Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component

Summary

Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Severity ?

No CVSS data available.

Assigner

mozilla

References

URL

Tags

	https://bugzilla.mozilla.org/show_bug.cgi?id=2016358
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

Vendor

Product

Version

Mozilla

Firefox

Affected: unspecified , < 148 (custom)

Mozilla	Firefox ESR	Affected: unspecified , < 115.33 (custom)
Mozilla	Firefox ESR	Affected: unspecified , < 140.8 (custom)
Mozilla	Thunderbird	Affected: unspecified , < 148 (custom)
Mozilla	Thunderbird	Affected: unspecified , < 140.8 (custom)

Credits

Sajeeb Lohani

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "148",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Firefox ESR",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "115.33",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Firefox ESR",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "140.8",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "148",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "140.8",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Sajeeb Lohani"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Sandbox escape due to incorrect boundary conditions in the DOM: Core \u0026 HTML component. This vulnerability affects Firefox \u003c 148, Firefox ESR \u003c 115.33, Firefox ESR \u003c 140.8, Thunderbird \u003c 148, and Thunderbird \u003c 140.8."
            }
          ],
          "value": "Sandbox escape due to incorrect boundary conditions in the DOM: Core \u0026 HTML component. This vulnerability affects Firefox \u003c 148, Firefox ESR \u003c 115.33, Firefox ESR \u003c 140.8, Thunderbird \u003c 148, and Thunderbird \u003c 140.8."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-24T17:30:29.886Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2016358"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-13/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-14/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-15/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-16/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-17/"
        }
      ],
      "title": "Sandbox escape due to incorrect boundary conditions in the DOM: Core \u0026 HTML component"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-2778",
    "datePublished": "2026-02-24T13:33:13.564Z",
    "dateReserved": "2026-02-19T15:06:06.469Z",
    "dateUpdated": "2026-02-24T17:30:29.886Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

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.

Action not permitted

GHSA-3QGM-JCXP-M9M6

CVE-2026-2778 (GCVE-0-2026-2778)

Tags

Sightings

Nomenclature