ChromeWeb browser · Google
CVE-2025-12445
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 · uneditedPolicy bypass in Extensions in Google Chrome prior to 142.0.7444.59 allowed an attacker who convinced a user to install a malicious extension to leak cross-origin data via a crafted Chrome Extension. (Chromium security severity: Low)
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 policy bypass in Chrome's extension system prior to version 142.0.7444.59 allows a malicious extension installed by the user to circumvent same-origin policies and leak data from cross-origin contexts.
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
< 142.0.7444.59CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 Chrome versionNavigate to chrome://settings/help or use the Chrome menu > Help > About Google Chrome to view the installed version numberAffected if Version is below 142.0.7444.59
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Review installed extensionsNavigate to chrome://extensions/ and enable Developer mode to see the list of installed extensions with their IDs and permissionsAffected if Any extension is installed from an untrusted or unknown source
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Audit extension permissionsIn chrome://extensions/, click on each extension's Details button and review the Permissions section for broad access such as 'Read and change your data on all websites' or 'cookies'Affected if An installed extension has permissions that allow access to cross-origin data or all websites
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Check for extensions with host permissionsIn the extensions management page, identify extensions listed with 'Access your data on all websites' or specific domain permissions under Host permissionsAffected if An extension with broad host permissions is present and the Chrome version is below 142.0.7444.59
User is affected if Chrome version is below 142.0.7444.59 AND a malicious or untrusted extension with broad permissions (especially host access to websites) is installed in the browser
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 · scoped142.0.7444.59
Update Chrome to version 142.0.7444.59 or later. Avoid installing extensions from untrusted sources.
Chrome 142.0.7444.59 or later
- Open Chrome and navigate to Settings > Help > About Google Chrome to check the current version
- If the version is below 142.0.7444.59, Chrome will automatically check for and install updates
- Restart Chrome after the update completes to apply the fix
- Alternatively, download the latest Chrome version directly from chrome://settings/help or the official Google Chrome website
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Chrome
Scoped from the published advisory
- Consultation1.0 h
- Implementation2.0 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 $1,424.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-12445 — 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-2025-12445 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