CVE-2024-5840Network attack vector

Access-control bypass via crafted HTML

Published Jun 11, 2024 · Updated Mar 13, 2025

Policy bypass in CORS in Google Chrome before 126.0.6478.54 allows remote attackers to bypass discretionary access control via crafted HTML. The public advisory names the CORS component, but the Chromium issue requires sign-in and no public source identifies the faulty check or code path. Exploitation requires a user to load attacker-controlled HTML and permits unauthorized cross-origin actions, with no reported data disclosure or service interruption.

CVSS severity6.5
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Policy bypass in CORS in Google Chrome before 126.0.6478.54 allows remote attackers to bypass discretionary access control via crafted HTML. The public advisory names the CORS component, but the Chromium issue requires sign-in and no public source identifies the faulty check or code path. Exploitation requires a user to load attacker-controlled HTML and permits unauthorized cross-origin actions, with no reported data disclosure or service interruption.

The record

CVE
CVE-2024-5840
Published
Jun 11, 2024
Updated
Mar 13, 2025
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-284, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2025Record 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=39
  2. Affected versionversion=40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fedora Project · Fedora Linuxversion=39; version=40
Google Cloud · Google Chromeversion=0 <126.0.6478.54; version=126.0.6478.54 <126.0.6478.54

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5CISA-ADPCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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
T1203Exploitation for Client Execution

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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