CVE-2021-30153Network attack vector

Authenticated hidden-user disclosure via ApiVisualEditor

Published Apr 15, 2023 · Updated Feb 6, 2025

Information disclosure in MediaWiki VisualEditor before 1.31.13 and 1.32.0 through 1.35.1 allows remote authenticated users to identify hidden users. ApiVisualEditor returns a distinguishable result for a user-page edit request when the named account exists but is hidden, rather than treating that account as nonexistent. An authenticated editor must target a user page; the observable difference reveals account existence but does not expose the hidden account's content.

CVSS severity4.3
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in MediaWiki VisualEditor before 1.31.13 and 1.32.0 through 1.35.1 allows remote authenticated users to identify hidden users. ApiVisualEditor returns a distinguishable result for a user-page edit request when the named account exists but is hidden, rather than treating that account as nonexistent. An authenticated editor must target a user page; the observable difference reveals account existence but does not expose the hidden account's content.

The record

CVE
CVE-2021-30153
Published
Apr 15, 2023
Updated
Feb 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-668, T1087
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2025Record 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

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.3CISA-ADPCVSS: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 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-668Exposure of Resource to Wrong Sphere
T1087Account Discovery

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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