CVE-2026-8969

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CVSS Details

CVSS Score

8.1

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Configurations (Affected Products)

No configuration data available.

Mozilla Firefox < 151

Mozilla Thunderbird < 151

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
// PoC for CVE-2026-8969 DOM Security Mitigation Bypass
// This is a conceptual demonstration.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8969 PoC</title>
</head>
<body>
<script>
    // Attempt to exploit the mitigation bypass
    function exploit() {
        try {
            // Hypothetical bypass of DOM security restrictions
            let sensitiveData = window.exploitTarget.internalData;
            alert("Bypass Successful! Data: " + sensitiveData);
        } catch (e) {
            console.log("Exploit failed or patch applied: " + e.message);
        }
    }

    // Trigger on interaction
    document.addEventListener('click', exploit);
</script>
<p>Click anywhere to test vulnerability.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8969
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8969
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8969/
[4] VulDB https://vuldb.com/cve/CVE-2026-8969
[5] https://bugzilla.mozilla.org/show_bug.cgi?id=2031123
[6] https://www.mozilla.org/security/advisories/mfsa2026-46/
[7] https://www.mozilla.org/security/advisories/mfsa2026-50/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8969", "sourceIdentifier": "[email protected]", "published": "2026-05-19T14:16:53.390", "lastModified": "2026-05-19T18:16:36.520", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-693"}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2031123", "source": "[email protected]"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-46/", "source": "[email protected]"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2026-50/", "source": "[email protected]"}]}}