What is CVE-2026-87518?

CVE-2026-87518 is a medium-severity vulnerability in Google Chrome, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2026-09-09.

How severe is CVE-2026-87518?

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

Vulnerability in Google Chrome

CVE-2026-87518

Observable discrepancy in Safebrowsing in Google Chrome on on iOS prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially obtain sensitive information 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 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.7th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Google Chrome

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/517917560 (Permissions Required)

Frequently asked questions

What is CVE-2026-87518?: CVE-2026-87518 is a medium-severity vulnerability in Google Chrome, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2026-09-09.
How severe is CVE-2026-87518?: Medium severity. CVSS v3 base score is 5.3 out of 10.