CVE-2023-48003Public exploitNetwork attack vector

Open redirect via unsanitized WebSocket message HTML

Published Dec 26, 2023 · Updated Aug 2, 2024

HTML injection in ASP.NET Zero before 12.3.0 allows remote attackers to redirect targeted users through crafted WebSocket messages. The dashboard renders message content as active HTML without neutralizing a meta refresh element, making its browser navigation target attacker-controlled. A targeted user must be online and have the message appear on the dashboard; the redirect then occurs without further interaction and can send the browser to any URL.

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

HTML injection in ASP.NET Zero before 12.3.0 allows remote attackers to redirect targeted users through crafted WebSocket messages. The dashboard renders message content as active HTML without neutralizing a meta refresh element, making its browser navigation target attacker-controlled. A targeted user must be online and have the message appear on the dashboard; the redirect then occurs without further interaction and can send the browser to any URL.

The record

CVE
CVE-2023-48003
Published
Dec 26, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 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 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 exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')

Public exploit references

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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