ChromeWeb browser · Google
CVE-2026-12459
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedInappropriate implementation in Serial in Google Chrome prior to 149.0.7827.155 allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security severity: High)
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA universal cross-site scripting (UXSS) vulnerability in Google Chrome's Serial API implementation allows a remote attacker to inject arbitrary scripts or HTML via a crafted HTML page. The Serial API, which enables web pages to communicate with serial devices, has an improper input validation or context handling flaw that bypasses same-origin policy protections.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
ChromeWeb browser
< 149.0.7827.155CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check your Chrome version numberOpen Chrome and navigate to chrome://version, or click Menu > Help > About Google Chrome. Note the full version string displayed.Affected if The version number is less than 149.0.7827.155 (for example, 149.0.7827.100 or any earlier version).
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Confirm Chrome is the affected browserVerify the browser you are checking is Google Chrome and not a Chromium-based alternative (such as Edge, Brave, or Opera) which may have different version numbering.Affected if You are using Google Chrome with a version below 149.0.7827.155.
You are affected if you are running Google Chrome version lower than 149.0.7827.155, regardless of whether you actively use the Serial API, because the vulnerability exists in the browser's implementation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped149.0.7827.155
Update Google Chrome to version 149.0.7827.155 or later to patch the Serial API vulnerability. Users should avoid visiting untrusted websites until the browser is updated.
Chrome 149.0.7827.155 or later
- Open Google Chrome browser
- Click the three-dot menu in the top-right corner
- Select 'Help' and then 'About Google Chrome'
- Chrome will automatically check for updates
- If an update is available, Chrome will download and install version 149.0.7827.155 or later
- Restart the browser to complete the update
- Verify the version by returning to About Google Chrome and confirming the version number is 149.0.7827.155 or higher
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Chrome
Scoped from the published advisory
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-12459 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-12459 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data