CVE-2021-34627Network attack vector

Subscriber-level extension disclosure via unchecked role lookup

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 view administrator-added extensions. The getSelectedMimeTypesByRole function returns approved MIME types for a requested role without verifying that the caller may inspect that role's configuration. Subscriber-level access is sufficient, and the consequence is limited to disclosure of configured extensions rather than their modification.

CVSS severity4.3
Medium
EPSS probability0.70%
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 view administrator-added extensions. The getSelectedMimeTypesByRole function returns approved MIME types for a requested role without verifying that the caller may inspect that role's configuration. Subscriber-level access is sufficient, and the consequence is limited to disclosure of configured extensions rather than their modification.

The record

CVE
CVE-2021-34627
Published
Jul 7, 2021
Updated
Sep 16, 2024
Vendor
Sajjad Hossain
Product
WP Upload Restriction
Classifications
CWE-284
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

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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