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UXSS in Google Chrome Views on Linux

IdentifiersCVE-2026-12463CWE-79

CVE-2026-12463 is a high-severity inappropriate implementation vulnerability in the Views component of Google Chrome on Linux prior to 149.0.7827.155. According to the provided advisory, a remote attacker who had already compromised the renderer process could, via a crafted HTML page, inject arbitrary scripts or HTML and achieve universal cross-site scripting (UXSS). The issue is described by Chromium as an inappropriate implementation flaw in Views rather than a memory-safety bug. The available information does not identify a specific vulnerable function.

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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 arbitrary script or HTML injection in the browser context as a UXSS condition. This can enable bypass of normal same-origin browser security boundaries, execution of attacker-controlled script in unintended origins, unauthorized actions in authenticated web sessions, exposure of sensitive web data, and potential session compromise. The flaw is also relevant as a post-renderer-compromise primitive that could be used in exploit chains to expand impact beyond the renderer sandbox.

Mitigation

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

No specific temporary workaround is provided in the supplied advisories. Practical mitigation is to update affected browsers promptly. Where immediate patching is not possible, reduce exposure by limiting use of untrusted web content, applying browser isolation or similar defense-in-depth controls, and monitoring for outdated Chrome/Chromium/Edge deployments.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome on Linux to version 149.0.7827.155 or later. For downstream Chromium-based products, apply the corresponding vendor fixes; the provided content notes Microsoft Edge is fixed in version 149.0.4022.80 and Debian Chromium packages are fixed in 149.0.7827.155-1~deb13u1 for Debian 13 and 149.0.7827.155-1~deb12u1 for Debian 12.
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.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

6 SOURCESView more in app
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.
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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 activity1

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12463
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12463
MITRE CWE · CWE-79
cwe.mitre.org