What is CVE-2026-87563?

CVE-2026-87563 is a medium-severity vulnerability in Google Chrome, classified under Origin Validation Error. CVSS score: 4.3/10. Published 2026-09-09.

How severe is CVE-2026-87563?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Google Chrome

CVE-2026-87563

Origin validation error in Paint in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)

Published 2026-09-09 · last modified 2026-09-09.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (11.1th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Chrome

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/532952073 (Permissions Required)

Frequently asked questions

What is CVE-2026-87563?: CVE-2026-87563 is a medium-severity vulnerability in Google Chrome, classified under Origin Validation Error. CVSS score: 4.3/10. Published 2026-09-09.
How severe is CVE-2026-87563?: Medium severity. CVSS v3 base score is 4.3 out of 10.