CVE-2023-52263Network attack vector

Browser crash via overbroad WebUI scheme handling

Published Dec 30, 2023 · Updated Aug 2, 2024

Improper WebUI scheme validation in Brave Browser before 1.59.40 allows remote attackers to crash the browser via a crafted URL. HandleURLOverrideRewrite and GetWebUIFactoryFunction accepted chrome-untrusted and chrome-devtools URLs, then applied Brave WebUI host rewrites intended only for brave and chrome schemes. Exploitation requires a user to open attacker-controlled content; the documented consequence is a browser crash, not system compromise.

CVSS severity6.1
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper WebUI scheme validation in Brave Browser before 1.59.40 allows remote attackers to crash the browser via a crafted URL. HandleURLOverrideRewrite and GetWebUIFactoryFunction accepted chrome-untrusted and chrome-devtools URLs, then applied Brave WebUI host rewrites intended only for brave and chrome schemes. Exploitation requires a user to open attacker-controlled content; the documented consequence is a browser crash, not system compromise.

The record

CVE
CVE-2023-52263
Published
Dec 30, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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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-601URL Redirection to Untrusted Site ('Open Redirect')
T1499.004Application or System Exploitation

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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