CVE-2026-121102

chromium-browser: Missing authorization in BackgroundFetch

Published Nov 3, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
Missing authorization in BackgroundFetch in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Title chromium-browser: Missing authorization in BackgroundFetch
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
Title BackgroundFetch Authorization Bypass Allowing Same‑Origin Policy Violations
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title BackgroundFetch Authorization Bypass Allowing Same‑Origin Policy Violations
Type Values Removed Values Added
First Time appeared Google
Google chrome
Vendors & Products Google
Google chrome
Type Values Removed Values Added
Description Missing authorization in BackgroundFetch in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)
Weaknesses CWE-862
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
Chrome
Published
Updated
Nov 4, 2026, 8:21 PM
Reserved
Nov 3, 2026, 9:29 AM
Status
Analyzed
Published
Nov 3, 2026, 9:17 PM
Modified
Nov 5, 2026, 2:54 PM
Severity
Moderate
Public date
Nov 3, 2026, 8:42 PM