CVE-2021-34626Network attack vector

Authenticated extension deletion via unchecked deleteCustomType

Published Jul 7, 2021 · Updated Sep 16, 2024

Improper access control in WP Upload Restriction 2.2.3 and earlier allows remote authenticated users to delete custom file extensions. The deleteCustomType function processes deletion requests without enforcing an administrator-only capability check, removing administrator-defined extension settings. Any low-level WordPress account can reach the operation; the bounded impact is unauthorized modification of upload-policy configuration.

CVSS severity4.3
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in WP Upload Restriction 2.2.3 and earlier allows remote authenticated users to delete custom file extensions. The deleteCustomType function processes deletion requests without enforcing an administrator-only capability check, removing administrator-defined extension settings. Any low-level WordPress account can reach the operation; the bounded impact is unauthorized modification of upload-policy configuration.

The record

CVE
CVE-2021-34626
Published
Jul 7, 2021
Updated
Sep 16, 2024
Vendor
Sajjad Hossain
Product
WP Upload Restriction
Classifications
CWE-284, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.2.3 <=2.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sajjad Hossain · WP Upload Restrictionversion=2.2.3 <=2.2.3

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:N
4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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