CVE-2021-42228Public exploitNetwork attack vector

Unauthorized actions via uploadbutton cross-site request forgery

Published Oct 14, 2021 · Updated Aug 4, 2024

Cross-site request forgery in KindEditor 4.1.12 and earlier allows remote attackers to act with a victim's authority via a crafted HTML file. The examples/uploadbutton.html demonstration accepts attacker-uploaded HTML and permits requests without verifying the victim's intent. Exploitation requires a user to follow the malicious link while holding authority on the hosting site; the public record does not identify the exact privileged operation reached.

CVSS severity8.8
High
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in KindEditor 4.1.12 and earlier allows remote attackers to act with a victim's authority via a crafted HTML file. The examples/uploadbutton.html demonstration accepts attacker-uploaded HTML and permits requests without verifying the victim's intent. Exploitation requires a user to follow the malicious link while holding authority on the hosting site; the public record does not identify the exact privileged operation reached.

The record

CVE
CVE-2021-42228
Published
Oct 14, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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?

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

8.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
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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