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Google Chrome CVE-2026-106183

| EUVDEUVD-2026-93577 MEDIUM
Missing Authorization (CWE-862)
2026-10-06 Chrome GHSA-qjgr-ch5f-854r
5.9
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
    Reach Chromoting network endpoint
  2. Delivery
    Send crafted remoting traffic
  3. Exploit
    Bypass missing authorization check
  4. Execution
    Read unauthorized sensitive data
  5. Impact
    Exfiltrate disclosed information

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Authorization checks on every request
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

Requires that the Chrome Remote Desktop (Chromoting) functionality is in use on the target Windows host running Chrome prior to 155.0.8059.39, and that the attacker can send crafted network traffic to the remoting endpoint. The CVSS AC:H rating means exploitation is gated by conditions the attacker cannot fully control - plausibly an active or establishing remoting session, specific protocol state, or timing - which limits reliability. No authentication is required (PR:N) and no user interaction is needed (UI:N), but the dependence on the Chromoting feature being active is the key limiting factor; hosts not using Chrome Remote Desktop are not exposed.

Impact

This is a genuinely moderate-priority issue rather than a false alarm, and the signals are internally consistent. The CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N) describes a network-reachable, unauthenticated flaw, but the High attack complexity (AC:H) indicates exploitation depends on conditions outside the attacker's control (e.g. an active Chrome Remote Desktop/Chromoting session and specific timing or state), which materially lowers real-world likelihood. Impact is confidentiality-only (C:H/I:N/A:N) - information disclosure, not code execution - consistent with Chromium's self-assigned Medium severity and the 5.9 base score. No EPSS score was supplied, so exploitation probability cannot be quantified; this gap should be noted explicitly. The CVE is NOT in CISA KEV and no public POC is referenced, so there is no public exploit identified at time of analysis. No SSVC decision data was provided. Net: patch in normal cadence - the AC:H condition and confidentiality-only impact make this lower urgency than the network/unauthenticated vector alone would suggest.

Exploit ScenarioDerived

An attacker positioned on the network path to a host running Chrome Remote Desktop (Chromoting) sends crafted network traffic to the remoting endpoint, exploiting a missing authorization check to read data it should not have access to. Because attack complexity is High, the attacker must satisfy conditions such as an active remoting session or precise timing, and the payoff is disclosure of sensitive information rather than control of the host. No public exploit code is identified at time of analysis.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 06, 2026

Missing authorization in the Chromoting (Chrome Remote Desktop) component of Google Chrome on Windows prior to 155.0.8059.39 lets a remote, unauthenticated attacker obtain sensitive information by sending crafted network traffic to a remoting endpoint. The flaw carries a CVSS 3.1 base score of 5.9 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N), meaning no credentials or user interaction are needed but successful exploitation is gated by conditions the attacker cannot fully control; there is no public exploit identified at time of analysis. Exposure is limited to hosts that actually have the Chromoting/Chrome Remote Desktop functionality in use, and Google has shipped a fixed build rated Medium severity.

RemediationAI

Vendor-released patch: upgrade Google Chrome on Windows to 155.0.8059.39 or later via the Stable Channel update described at https://chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_086471744.html, and note that Chrome's auto-update mechanism should apply it, so verify the installed version from chrome://version. Until that build is deployed, the most direct compensating control is to disable or remove the Chrome Remote Desktop / Chromoting host component on affected machines (or stop the Chromoting host service), which removes the vulnerable endpoint entirely at the cost of losing remote access and support capability to that host. Alternatively, restrict network reachability to the remoting endpoint - keep the host off untrusted networks, block inbound connections to the remoting service (typically TCP 443) and limit outbound remoting traffic via egress policy - which reduces exposure but does not eliminate the flaw and may break legitimate remote sessions or NAT traversal. Because opportunistic exploitation is possible without credentials or user interaction, prioritize patching hosts that must retain remote desktop functionality; there is no report of active exploitation, so emergency removal of Chrome is not warranted. The upstream issue at https://issues.chromium.org/issues/553154579 can be tracked for additional detail once the restriction on technical information is lifted.

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 affected technology is Chromoting, the remoting protocol and host stack behind Chrome Remote Desktop, which brokers screen capture, input, and session data between a host machine and remote clients over Google's infrastructure and network connections. The root cause is CWE-862 (Missing Authorization): a remoting code path fails to enforce an authorization check before returning data, so a party that can reach the endpoint and craft the right traffic can read information it should not be entitled to. The CVSS vector's PR:N/UI:N indicates no authentication or user interaction is required, while AC:H reflects that the attacker must satisfy preconditions they do not fully control - most plausibly an active or establishing remoting session, a specific protocol state, or timing - which keeps reliability low. Impact is confined to confidentiality (C:H) with no integrity or availability effect, consistent with an information-disclosure-only defect rather than code execution or denial of service. Per the supplied CPE (cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*) and EUVD entry (EUVD-2026-93577), only the Chrome build prior to 155.0.8059.39 on Windows is in scope.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (Chrome) PRIMARY 5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI 5.9 MEDIUM

Crafted network traffic gives AV:N; dependence on an active Chromoting session/timing gives AC:H; no auth (PR:N/UI:N); missing-authorization info disclosure yields C:H with I:N/A:N.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/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
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
CVSS changed
Oct 06, 2026 - 21:22 NVD
5.9 (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 5.9

DescriptionCVE.org

Missing authorization in Chromoting in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker to obtain sensitive information via crafted network traffic. (Chromium security severity: Medium)

Threat Intelligence Overview

EPSS Score
0.3%
Top 84% exploitable
Prevalence
Ubiquitous
Google Chrome is one of the most widely deployed browsers worldwide
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 0.3%
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
Medium
Technical Impact
Partial

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

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Vendor StatusVendor

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