CVE-2023-1283Network attack vector

Unauthenticated code execution via Function deserialization

Published Mar 8, 2023 · Updated Mar 5, 2025

Code injection in Builder.io Qwik before 0.21.0 allows remote attackers to execute arbitrary JavaScript in the Node.js server process. The PureFunctionSerializer prepare path passes client-controlled serialized function text to the Function constructor through new Function('return ' + data)(). A Qwik application must expose the pureServerFunction feature to client requests; successful exploitation runs code with the server process's privileges.

CVSS severity10.0
Critical
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Code injection in Builder.io Qwik before 0.21.0 allows remote attackers to execute arbitrary JavaScript in the Node.js server process. The PureFunctionSerializer prepare path passes client-controlled serialized function text to the Function constructor through new Function('return ' + data)(). A Qwik application must expose the pureServerFunction feature to client requests; successful exploitation runs code with the server process's privileges.

The record

CVE
CVE-2023-1283
Published
Mar 8, 2023
Updated
Mar 5, 2025
Vendor
Builder.io
Product
Qwik
Classifications
CWE-94, T1190, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <0.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Builder.io · Qwikversion=unspecified <0.21.0

Published CVSS scores

9.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0@huntrdevCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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-94Improper Control of Generation of Code
T1190Exploit Public-Facing Application
T1059.007JavaScript/JScript

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo