# CVE-2026-17903: Cross-site scripting in Chrome

> An attacker on the local network can inject scripts into privileged Chromecast pages in Google Chrome, potentially executing code or bypassing security controls.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Jul 2026
- **Updated:** 30 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-17903, ECHO-83d4-def5-77bb, GHSA-6m4c-qhgh-r7qc, MINI-vmh3-6rfj-jghx

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-17903?

It affects 1 product.


Products: Google Chrome.

## How do I fix CVE-2026-17903?

Upgrade to a fixed version.

## 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](https://insights.sbomify.com/CVE-2022-4135/): Google Chromium GPU Heap Buffer Overflow (critical 9.6, exploited in the wild)
- [CVE-2020-16017](https://insights.sbomify.com/CVE-2020-16017/): Google Chrome Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2020-16010](https://insights.sbomify.com/CVE-2020-16010/): Google Chrome for Android UI Heap Buffer Overflow (critical 9.6, exploited in the wild)
- [CVE-2026-87491](https://insights.sbomify.com/CVE-2026-87491/): Google Chromium V8 Out of Bounds Write (high 8.8, exploited in the wild)
- [CVE-2026-85046](https://insights.sbomify.com/CVE-2026-85046/): Google Chromium V8 Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-17903 and fix it if it is affected.

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

Affected product: Google Chrome. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-17903/ (Markdown: https://insights.sbomify.com/CVE-2026-17903/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-17903
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-17903
- OSV: https://osv.dev/vulnerability/CVE-2026-17903

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-17903/
Summaries are generated and may contain mistakes; the official description above is the record.