PatchSiren cyber security CVE debrief

CVE-2026-106366 Google CVE debrief

CVE-2026-106366 debrief based on CVE Program and NVD records. Google Chrome on Android prior to 155.0.8059.39 had an incomplete cleanup issue in CustomTabs, allowing remote attackers to bypass web origin policy via crafted HTML pages. The issue was reported and patched, with defenders needing to verify Chrome versions and update to prevent exposure. This CVE was published on 2026-10-06T18:41:07.001Z and has not been modified since then. The CVE Program and NVD records provide further details on the vulnerability.

Vendor: Google
Product: Chrome
CVSS: Unknown
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-10-06
Original CVE updated: 2026-10-14
Advisory published: 2026-10-06
Advisory updated: 2026-10-14

Who should care

Defenders responsible for managing Google Chrome on Android devices should assess exposure and prioritize updates. This includes verifying Chrome versions and updating to 155.0.8059.39 or later to prevent web origin policy bypass. Security teams and vulnerability management teams should also review the CVE Program and NVD records for further details on the vulnerability and its impact.

Why it matters

CVE-2026-106366 allows remote attackers to bypass web origin policy in Google Chrome on Android prior to 155.0.8059.39. Defenders should verify Chrome versions and update to prevent exposure.

Verify Chrome version is 155.0.8059.39 or later to prevent web origin policy bypass
Update Chrome to ensure proper cleanup in CustomTabs
Monitor Chrome releases for future security updates

Technical summary

Google Chrome on Android prior to 155.0.8059.39 had an incomplete cleanup issue in CustomTabs. This allowed remote attackers to bypass web origin policy via crafted HTML pages. The issue was reported and patched, with defenders needing to verify Chrome versions and update to prevent exposure. The CVE Program and NVD records provide further details on the vulnerability. Defenders should prioritize verifying Android Chrome versions and updating to 155.0.8059.39 or later. The vulnerability was published on 2026-10-06T18:41:07.001Z and has not been modified since then.

Defensive priority

Defenders should prioritize verifying Android Chrome versions and updating to 155.0.8059.39 or later.

Recommended defensive actions

Verify Android Chrome versions are 155.0.8059.39 or later
Update Chrome to 155.0.8059.39 or later
Monitor Chrome releases for future updates
Review compensating controls for exposed systems while remediation is scheduled and verified
Check relevant monitoring, detection, and logs for exposed assets that need extra review
Track exceptions, retest remediated assets, and close the item only after evidence is documented
Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Evidence from CVE Program and NVD records indicate an incomplete cleanup issue in CustomTabs of Google Chrome on Android. The issue allowed bypassing web origin policy via crafted HTML pages. Defenders should verify Chrome versions and update to 155.0.8059.39 or later to prevent exposure. The CVE Program and NVD records provide further details on the vulnerability.

Sources and references

Verified primary and authoritative sources

CVE-2026-106366 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-106366

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-106366 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-106366

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

CVE-2026-106366
Unverified legacy reference

URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/106xxx/CVE-2026-106366.json

cve_program_cvelist_v5
Source reference
Unverified legacy reference

URL: https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_086471744.html

Supplemental source
Source reference
Unverified legacy reference

URL: https://issues.chromium.org/issues/552115620

Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.