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Mallory
Medium

Script/HTML Injection in Google Chrome DevTools via Malicious Extension

IdentifiersCVE-2026-3063CWE-74

Google Chrome prior to 145.0.7632.116 contains an inappropriate implementation flaw in DevTools that allows a malicious browser extension, once installed by a user, to inject script or HTML into a privileged browser page via DevTools. The issue affects the boundary handling between extension-controlled content and privileged DevTools/browser pages, enabling untrusted extension input to be rendered or executed in a more privileged context than intended.

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For your environment

Are you exposed to this one?

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an attacker who has convinced a user to install a malicious extension to inject script or HTML into a privileged page within Chrome. This can enable manipulation of privileged browser UI/content and may lead to exposure of sensitive data available in that context or bypass of intended browser security boundaries. The Chromium severity is rated High.

Mitigation

If you can’t patch tonight, do this now.

Until patches are fully deployed, reduce exposure by preventing installation of untrusted extensions, enforcing enterprise extension allowlists/blocklists, restricting extension installation sources to trusted stores, and auditing/removing unknown or unnecessary extensions. Restrict DevTools access where feasible through enterprise policy.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 145.0.7632.116 or later. For Debian chromium packages, upgrade to 145.0.7632.116-1~deb12u1 on bookworm or 145.0.7632.116-1~deb13u1 on trixie, as applicable.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
GoogleChromeapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4

Community discussion across Reddit, Mastodon, and other social sources.