CVE-2026-40419

Description

Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Microsoft Office (具体版本需参考官方公告)

PoC / Exploit Code

⚠ For Security Research Only

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

python

// Conceptual PoC for Use-After-Free
#include <iostream>
#include <cstdlib>

class VulnerableObject {
public:
    virtual void action() { std::cout << "Normal action" << std::endl; }
};

int main() {
    VulnerableObject* obj = new VulnerableObject();
    delete obj; // Object is freed
    
    // Use after free simulation
    obj->action(); // Accessing freed memory
    
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-40419
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-40419
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-40419/
[4] VulDB https://vuldb.com/cve/CVE-2026-40419
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40419

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-40419", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:20.070", "lastModified": "2026-05-13T15:34:52.573", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40419", "source": "[email protected]"}]}}