CVE-2022-23390Public exploitNetwork attack vector

Administrator code execution via weak upload validation

Published Feb 14, 2022 · Updated Aug 3, 2024

Unrestricted file upload in BBS Forum 5.3 and earlier allows remote authenticated users to upload executable server-side files. The getType routine trusts detected file content when Content-Type is application/octet-stream but does not strictly validate the supplied filename suffix, permitting a JSP filename. Administrator access is required to reach the upload workflow, and a successful upload places a web shell on the server for code execution.

CVSS severity9.8
Critical
EPSS probability1.45%
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 BBS Forum 5.3 and earlier allows remote authenticated users to upload executable server-side files. The getType routine trusts detected file content when Content-Type is application/octet-stream but does not strictly validate the supplied filename suffix, permitting a JSP filename. Administrator access is required to reach the upload workflow, and a successful upload places a web shell on the server for code execution.

The record

CVE
CVE-2022-23390
Published
Feb 14, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 14, 2022CVE 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

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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