CVE-2021-28379Public exploitNetwork attack vector

Cross-origin file upload via missing Origin validation

Published Mar 15, 2021 · Updated Aug 3, 2024

Unrestricted file upload in Vesta Control Panel through 0.9.8-27 allows remote attackers to upload files via cross-origin requests. The web/upload/UploadHandler.php endpoint accepted upload requests without validating the HTTP Origin header, allowing a different-origin page to submit the operation. Exploitation requires a victim browser context that can reach the panel; uploaded content can alter hosted files and potentially affect confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability6.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Vesta Control Panel through 0.9.8-27 allows remote attackers to upload files via cross-origin requests. The web/upload/UploadHandler.php endpoint accepted upload requests without validating the HTTP Origin header, allowing a different-origin page to submit the operation. Exploitation requires a victim browser context that can reach the panel; uploaded content can alter hosted files and potentially affect confidentiality, integrity, and availability.

The record

CVE
CVE-2021-28379
Published
Mar 15, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NVDCVSS: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.

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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-434Unrestricted Upload of File with Dangerous Type
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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