CVE-2026-3934Network attack vector

Cross-origin session hijacking via unchecked WebSocket Origin

Published Mar 11, 2026 · Updated Mar 11, 2026

Same-origin policy bypass in ChromeDriver in Google Chrome before 146.0.7680.71 allows remote attackers to hijack a session via a crafted page. ChromeDriver's HTTP server accepts incoming WebSocket connections without checking the Origin header, enabling a page from another origin to control the driver. Exploitation requires interaction with attacker-controlled HTML while a reachable ChromeDriver server is running, and the demonstrated consequence is cross-origin session control rather than code execution.

CVSS severity6.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Same-origin policy bypass in ChromeDriver in Google Chrome before 146.0.7680.71 allows remote attackers to hijack a session via a crafted page. ChromeDriver's HTTP server accepts incoming WebSocket connections without checking the Origin header, enabling a page from another origin to control the driver. Exploitation requires interaction with attacker-controlled HTML while a reachable ChromeDriver server is running, and the demonstrated consequence is cross-origin session control rather than code execution.

The record

CVE
CVE-2026-3934
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-284, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=146.0.7680.71 <146.0.7680.71

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=146.0.7680.71 <146.0.7680.71

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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