What is CVE-2026-11278?

CVE-2026-11278 is a medium-severity vulnerability in Google Android, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2026-06-05.

How severe is CVE-2026-11278?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Google Android

CVE-2026-11278

Inappropriate implementation in CustomTabs in Google Chrome on Android prior to 149.0.7827.53 allowed a local attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Low)

Published 2026-06-05 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (3.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Google Android
Google Chrome — versions 149.0.7827.53

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html (Release Notes)
issues.chromium.org/issues/501859865 (Permissions Required)

Frequently asked questions

What is CVE-2026-11278?: CVE-2026-11278 is a medium-severity vulnerability in Google Android, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2026-06-05.
How severe is CVE-2026-11278?: Medium severity. CVSS v3 base score is 6.5 out of 10.