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Cross-origin data leak via incorrect security UI in Chrome Passwords

IdentifiersCVE-2026-12458CWE-451

CVE-2026-12458 is a high-severity incorrect security UI / inappropriate implementation vulnerability in the Passwords component of Google Chrome prior to 149.0.7827.155. According to the provided advisory text, a remote attacker can use a crafted HTML page and induce the victim to perform specific UI gestures, resulting in leakage of cross-origin data. The issue is described by Chromium as an inappropriate implementation in Passwords and by downstream advisories as an incorrect security UI flaw. No vulnerable function or lower-level root-cause details are provided in the supplied content.

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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 can disclose cross-origin data to a remote attacker. This is an information disclosure issue that breaks expected browser origin isolation or UI trust boundaries in the context of password-related browser functionality. The supplied content does not indicate direct code execution from this CVE alone.

Mitigation

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

No specific vendor workaround is provided in the supplied advisories beyond patching. Until updates are fully deployed, reduce exposure by limiting access to untrusted websites, enforcing rapid browser update policies, and using defense-in-depth controls such as browser isolation where available.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 149.0.7827.155 or later. For Microsoft Edge (Chromium-based), upgrade to version 149.0.4022.80 or later as documented by Microsoft. For Debian Chromium, apply the vendor-fixed packages, including 149.0.7827.155-1~deb13u1 for Debian stable (trixie) or 149.0.7827.155-1~deb12u1 for Debian oldstable (bookworm).
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-2026-12458
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12458
MITRE CWE · CWE-451
cwe.mitre.org