CVE-2024-21636Network attack vector

Cross-site scripting via unsanitized component output

Published Jan 4, 2024 · Updated Jun 17, 2025

Cross-site scripting in ViewComponent before 2.83.0 and 3.0.0 through 3.8.0 allows remote attackers to inject script via rendered components. The rendering path treats unsanitized return values from call() and output_postamble() as HTML instead of escaping untrusted content. Exposure requires direct controller rendering and, for call(), a component method rather than a sidecar template; a viewer must load the output, allowing script execution and limited reading or alteration of page data.

CVSS severity6.1
Medium
EPSS probability0.50%
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 ViewComponent before 2.83.0 and 3.0.0 through 3.8.0 allows remote attackers to inject script via rendered components. The rendering path treats unsanitized return values from call() and output_postamble() as HTML instead of escaping untrusted content. Exposure requires direct controller rendering and, for call(), a component method rather than a sidecar template; a viewer must load the output, allowing script execution and limited reading or alteration of page data.

The record

CVE
CVE-2024-21636
Published
Jan 4, 2024
Updated
Jun 17, 2025
Vendor
ViewComponent
Product
ViewComponent
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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=< 2.83.0
  2. Affected versionversion=>= 3.0.0, < 3.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ViewComponent · ViewComponentversion=< 2.83.0; version=>= 3.0.0, < 3.9.0

Published CVSS scores

6.1GitHub CNACVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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