What is CVE-2026-87453?

CVE-2026-87453 is a medium-severity vulnerability in Google Chrome, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 5.3/10. Published 2026-09-09.

How severe is CVE-2026-87453?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Google Chrome

CVE-2026-87453

Confused deputy in BackgroundFetch in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to leak sensitive information via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Google Chrome

Weakness classification (CWE)

CWE-441 — Unintended Proxy or Intermediary (Confused Deputy)

References

chrome-cve-admin@google.com (Release Notes, Vendor Advisory)
chrome-cve-admin@google.com (Permissions Required)

Frequently asked questions

What is CVE-2026-87453?: CVE-2026-87453 is a medium-severity vulnerability in Google Chrome, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 5.3/10. Published 2026-09-09.
How severe is CVE-2026-87453?: Medium severity. CVSS v3 base score is 5.3 out of 10.