CVE-2026-17903 Cross-site scripting in Chrome

What is CVE-2026-17903?

CVE-2026-17903 is a medium-severity cross-site scripting vulnerability in Google Chrome, published on 30 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Insufficient policy enforcement in Chromecast in Google Chrome prior to 151.0.7922.72 allowed an attacker on the local network segment to inject scripts or HTML into a privileged page via malicious network traffic. (Chromium security severity: Low)

Weakness: CWE-79

Which versions are affected by CVE-2026-17903?

It affects 1 product.

Products include Google Chrome.

How do I fix CVE-2026-17903?

Upgrade to a fixed version.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-17903 being exploited?

There is no known exploitation of CVE-2026-17903 in the wild and no public exploit code.

Other vulnerabilities in Google Chrome

• CVE-2022-4135 Google Chromium GPU Heap Buffer Overflow Exploited Critical 9.6
• CVE-2020-16017 Google Chrome Use-After-Free Exploited Critical 9.6
• CVE-2020-16010 Google Chrome for Android UI Heap Buffer Overflow Exploited Critical 9.6
• CVE-2026-87491 Google Chromium V8 Out of Bounds Write Exploited High 8.8
• CVE-2026-85046 Google Chromium V8 Type Confusion Exploited High 8.8

All Google Chrome vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-17903, ECHO-83d4-def5-77bb, GHSA-6m4c-qhgh-r7qc, MINI-vmh3-6rfj-jghx.