CVE-2023-0410Public exploitNetwork attack vector

Cross-site scripting via unsafe SSR attribute rendering

Published Jan 20, 2023 · Updated Apr 2, 2025

Cross-site scripting in Builder.io Qwik before 0.1.0-beta5 allows remote attackers to execute script in a user's browser via crafted SSR attributes. The SSR renderer appends attribute names without rejecting HTML syntax characters and writes class values without attribute escaping. Exploitation requires an application to render attacker-controlled attributes and a user to load the resulting page, enabling browser-context data access or modification.

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

Cross-site scripting in Builder.io Qwik before 0.1.0-beta5 allows remote attackers to execute script in a user's browser via crafted SSR attributes. The SSR renderer appends attribute names without rejecting HTML syntax characters and writes class values without attribute escaping. Exploitation requires an application to render attacker-controlled attributes and a user to load the resulting page, enabling browser-context data access or modification.

The record

CVE
CVE-2023-0410
Published
Jan 20, 2023
Updated
Apr 2, 2025
Vendor
Builder.io
Product
Qwik
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=unspecified <0.1.0-beta5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Builder.io · Qwikversion=unspecified <0.1.0-beta5

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1huntr.devCVSS:3.0/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.

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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