VulnerabilityPublished 8 Jun 2026

CVE-2026-11666: Google Chrome · Insufficient Validation of Untrusted Input

Affects Google ChromeSource CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium : upgrade to 149.0.7827.103 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 149.0.7827.103

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Google Chrome to 149.0.7827.103.

Affected software

Product	Affected	Fixed in
GoogleChrome	Affected >=149.0.7827.103 <149.0.7827.103	Fixed in 149.0.7827.103

AI-suggested

Until official confirmation of a fix, users should exercise caution when interacting with untrusted web content. No specific temporary mitigations are provided by the vendor.

Description

CVE-2026-11666 is a vulnerability in Google Chrome prior to version 149.0.7827.103 involving insufficient validation of untrusted input. This flaw allows a remote attacker to perform UI spoofing via a crafted HTML page. The vulnerability has a CVSS score of 5.4, indicating medium severity. No known exploits are reported in the wild. The vendor advisory linked does not explicitly confirm patch availability or remediation status.

Impact

An attacker can remotely induce a user to interact with a spoofed user interface element, potentially misleading the user. The impact is limited to UI spoofing with low confidentiality and availability impact. There is no indication of code execution or privilege escalation. No known exploits in the wild have been reported.

Summary

This vulnerability in Google Chrome involves insufficient validation of untrusted input, which can be exploited by a remote attacker to conduct UI spoofing attacks through specially crafted HTML content. The issue affects Chrome versions before 149.0.7827.103. The CVSS vector indicates the attack requires no privileges but user interaction, with low confidentiality impact and low availability impact. The vendor advisory is available but does not explicitly state if a fix has been released.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Jun 2026, 08:45 UTC

Technical details

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