CVE-2021-45471Public exploitNetwork attack vector

Unauthorized schema edits via incomplete permission checks

Published Dec 24, 2021 · Updated Aug 4, 2024

Authorization bypass in MediaWiki EntitySchema through 1.37 allows remote attackers to edit schema metadata from a globally blocked IP. SetEntitySchemaLabelDescriptionAliases relies on isBlockedFrom rather than the complete edit permission check, so global-block denials are missed. A blocked, logged-out or authenticated requester can change labels, descriptions, and aliases, and affected paths also permit new schema creation.

CVSS severity5.3
Medium
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in MediaWiki EntitySchema through 1.37 allows remote attackers to edit schema metadata from a globally blocked IP. SetEntitySchemaLabelDescriptionAliases relies on isBlockedFrom rather than the complete edit permission check, so global-block denials are missed. A blocked, logged-out or authenticated requester can change labels, descriptions, and aliases, and affected paths also permit new schema creation.

The record

CVE
CVE-2021-45471
Published
Dec 24, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 24, 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

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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

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1565.001Stored Data Manipulation

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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