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Google Chrome CVE-2026-106246

| EUVDEUVD-2026-93712 MEDIUM
Incorrect Authorization (CWE-863)
2026-10-06 Chrome GHSA-c329-r8pp-j9rg
5.4
CVSS 3.1 · Vendor: Chrome
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Lure victim to crafted HTML page
  2. Exploit
    Page triggers address-bar spoofing logic
  3. Execution
    Chrome displays falsified trusted URL
  4. Impact
    User trusts spoofed origin and submits credentials/data

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization logic validation
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires the attacker to control a web page and have the victim navigate to it (UI:R) - there is no authentication requirement (PR:N) and no special Chrome configuration is named in the description, so default installs of Chrome prior to 155.0.8059.39 are affected. The key limiting factors are: (1) the victim must actively visit the attacker's crafted HTML page, and (2) the impact is limited to spoofing the address bar - it does not by itself grant code execution or data access, so damage depends on the user being deceived into a subsequent action (e.g., entering credentials). Patched by updating to Chrome 155.0.8059.39 or later.

Impact

This is a medium-severity (CVSS 5.4) address-bar spoofing issue in Google Chrome stemming from incorrect authorization (CWE-863). The provided CVSS vector (AV:N/AC:L/PR:N/UI:R/S:U) indicates a network-reachable, low-complexity, unauthenticated attack that nonetheless requires user interaction - the victim must open an attacker-controlled HTML page. No EPSS score was supplied, the CVE is NOT on the CISA KEV list, and no public proof-of-concept is referenced, so there is no evidence of active or imminent widespread exploitation. The real-world priority is moderate rather than urgent: the signals are internally consistent (a spoofing/UI-deception flaw that aids phishing but yields no direct code execution or data theft), but the absence of EPSS data means statistical exploitation likelihood cannot be quantified. Note a scoring inconsistency to verify with the vendor: Google's input vector assigns C:L and A:L, yet an address-bar spoof's primary effect is misrepresentation of displayed content (an integrity concern), with no obvious confidentiality or availability impact - treat the exact impact metrics as vendor-assigned rather than independently confirmed. Given Chrome's enormous install base, even a medium spoofing bug is worth patching promptly as a phishing enabler, but it is not a high-priority RCE-class emergency.

Exploit ScenarioDerived

An attacker hosts a crafted HTML page and lures a victim to visit it (e.g., via a phishing link or malicious ad). The page manipulates Chrome's address bar so the displayed URL appears to belong to a trusted site, increasing the credibility of a follow-on phishing or credential-harvesting page. No public exploit code is identified at time of analysis, and successful deception depends on the user visiting the page and trusting the spoofed bar.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 07, 2026

Address-bar spoofing in Google Chrome prior to 155.0.8059.39 lets remote attackers misrepresent the page a victim is actually viewing, undermining the primary trust signal users rely on to confirm site identity. Exploitation requires the victim to navigate to an attacker-controlled crafted HTML page (UI:R, PR:N - no authentication needed), and the assessed impact is integrity-only: the deception itself does not grant code execution or direct data access, but it can be leveraged to trick users into submitting credentials or other sensitive information to a site they believe is legitimate. Google has released a fix in Chrome 155.0.8059.39; at time of analysis there is no confirmed active exploitation (not in CISA KEV) and no public exploit code identified, and Chromium rates the underlying issue as Medium severity.

RemediationAI

Upgrade to Google Chrome 155.0.8059.39 or later from the stable channel and fully restart the browser so the new binary is loaded - this is the vendor-released patch and the only complete fix. In managed fleets, enforce the update through Chrome Browser Cloud Management or the relevant platform policy (e.g. auto-update enforcement / minimum version policy) and verify the reported version, since the update is delivered silently and users may continue running a stale in-memory build until relaunch. Because the defect is an address-bar spoofing issue rather than a code-execution bug, there is no meaningful server-side or configuration workaround that removes the risk; blocking content or disabling features is not a viable compensating control. Until the update is applied, the practical mitigations are user-behavioral and only partial: train users to verify the site through independent means (bookmarks, externally obtained URLs, certificate details) before entering credentials on any page reached by an unsolicited link, and treat unexpected credential or MFA prompts as suspect. For Chromium-derived browsers, track the upstream Chromium commit and confirm whether the downstream vendor has shipped an equivalent fix; there is no separate patch listed for those products in the provided references. Full details and the fixed build number are in the Chrome release advisory at https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_086471744.html.

Affected VersionsENISA

Chrome 155.0.8059.39 <155.0.8059.39

Affected Packages

euvd chrome fix: 155.0.8059.39

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The root cause is classified as CWE-863 (Incorrect Authorization) in the browser's UI layer. In Chromium's multi-process architecture, page content is rendered in a sandboxed renderer while the address bar / omnibox is drawn by the privileged browser process from the origin state it believes has been committed for the active tab. This flaw indicates that the authorization checks governing what URL or origin the UI is permitted to display for a given document state were insufficient, allowing a crafted HTML page to induce a mismatch between the displayed address bar and the real document origin. The affected artifact is identified by CPE cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*, i.e. all Google Chrome builds below 155.0.8059.39 across supported desktop platforms; because the defect sits in shared Chromium UI/omnibox code, downstream Chromium-based browsers that have not yet absorbed the upstream fix may share the same exposure. The accompanying tags (Authentication Bypass) reflect that the spoofed origin can be used to defeat origin-based user trust decisions rather than to bypass an authentication mechanism programmatically.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (Chrome) PRIMARY 5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
vuln.today AI 4.3 MEDIUM

Remote crafted page with no auth but requires visiting it (UI:R); address-bar spoofing falsifies displayed content so I:L, with no real confidentiality or availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Red Hat 6.5 MEDIUM

Primary rating from Vendor (Chrome).

CVSS VectorVendor: Chrome

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

Lifecycle Timeline

4
CVSS changed
Oct 07, 2026 - 11:22 NVD
5.4 (MEDIUM)
Patch available
Oct 06, 2026 - 20:04 EUVD
CVE Published
Oct 06, 2026 - 18:41 cve.org
UNKNOWN (no severity yet)
CVE Published
Oct 06, 2026 - 18:41 cve.org
MEDIUM 5.4

DescriptionCVE.org

Incorrect authorization in Browser in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to spoof address bar via a crafted HTML page. (Chromium security severity: Medium)

Threat Intelligence Overview

EPSS Score
0.2%
Top 93% exploitable
Prevalence
Ubiquitous
Google Chrome is the dominant browser across consumer and enterprise environments
Data Quality
7 sources
Confidence: High

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +27
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Vendor StatusVendor

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