CVE-2026-16396 (GCVE-0-2026-16396)

Vulnerability from cvelistv5 – Published: 2026-07-21 12:38 – Updated: 2026-07-21 12:38
VLAI
Title
Privilege escalation in WebExtensions
Summary
Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Mozilla Firefox Unaffected: 140.13 , ≤ 140.* (rpm)
Unaffected: 153 , ≤ * (rpm)
Create a notification for this product.
Credits
Quy Pham
Show details on NVD website
To clipboard 

{
  "containers": {
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      "affected": [
        {
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          "vendor": "Mozilla",
          "versions": [
            {
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              "status": "unaffected",
              "version": "140.13",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "153",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Quy Pham"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13."
            }
          ],
          "value": "Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-21T12:38:09.831Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2047240"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-68/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-70/"
        }
      ],
      "title": "Privilege escalation in WebExtensions"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-16396",
    "datePublished": "2026-07-21T12:38:09.831Z",
    "dateReserved": "2026-07-20T21:57:23.712Z",
    "dateUpdated": "2026-07-21T12:38:09.831Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-07-22",
      "epss": "0.00142",
      "percentile": "0.03943"
    },
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    "suse_vex": {
      "aggregate_severity": "critical",
      "current_release_date": "2026-07-22T00:09:48Z",
      "cve": "CVE-2026-16396",
      "id": "CVE-2026-16396",
      "initial_release_date": "2026-07-22T00:09:48Z",
      "product_status:known_affected": "119",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-16396",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-16396.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.