{"id":"CVE-2025-9866","title":"Inappropriate implementation in Extensions in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to bypass content security policy via a crafted HTML page","summary":"Inappropriate implementation in Extensions in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Medium)","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-693"],"vendor":"google","product":"chrome","affected":["chrome < 140.0.7339.80"],"patched":["chrome 140.0.7339.80"],"published":"2025-09-03","updated":"2026-09-26","sourceUpdated":"2026-09-26T00:10:00.127","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-9866","references":[{"url":"https://chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop.html","label":"chrome-cve-admin@google.com"},{"url":"https://issues.chromium.org/issues/379337758","label":"chrome-cve-admin@google.com"}],"tags":["nvd"],"epss":0.00364,"epssPercentile":0.27555,"ingestedAt":"2026-09-26T00:22:39.908Z","slug":"CVE-2025-9866","body":"## Overview\n\nInappropriate implementation in Extensions in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Medium)\n\n## Affected\n\n- `chrome < 140.0.7339.80`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `chrome 140.0.7339.80`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}