CVE-2021-30155Public exploitNetwork attack vector

Restricted page creation via omitted permission check

Published Apr 9, 2021 · Updated Aug 3, 2024

Missing authorization in MediaWiki before 1.31.12 and 1.32.0 through 1.35.1 allows remote authenticated users to create restricted pages. ContentModelChange bypasses normal edit-page constraints and omits the create authorization check when the target page does not exist. An account with editcontentmodel permission but without page-creation permission can evade TitleBlacklist rules and write a new page with a chosen content model.

CVSS severity4.3
Medium
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in MediaWiki before 1.31.12 and 1.32.0 through 1.35.1 allows remote authenticated users to create restricted pages. ContentModelChange bypasses normal edit-page constraints and omits the create authorization check when the target page does not exist. An account with editcontentmodel permission but without page-creation permission can evade TitleBlacklist rules and write a new page with a chosen content model.

The record

CVE
CVE-2021-30155
Published
Apr 9, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 9, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/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 exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
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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