CVE-2013-6455Network attack vector

Unauthenticated username disclosure through page DOM

Published Jan 28, 2020 · Updated Aug 6, 2024

Information disclosure in MediaWiki CentralAuth before 1.19.10, 1.20.0 through 1.21.3, and 1.22.0 allows remote attackers to obtain usernames. The published record states only that CentralAuth writes the names into a page's DOM; Wikimedia has not disclosed the responsible function or request path. No authentication is required, and the disclosed consequence is limited to learning usernames from an affected wiki farm that has CentralAuth enabled.

CVSS severity5.3
Medium
EPSS probability1.13%
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 CentralAuth before 1.19.10, 1.20.0 through 1.21.3, and 1.22.0 allows remote attackers to obtain usernames. The published record states only that CentralAuth writes the names into a page's DOM; Wikimedia has not disclosed the responsible function or request path. No authentication is required, and the disclosed consequence is limited to learning usernames from an affected wiki farm that has CentralAuth enabled.

The record

CVE
CVE-2013-6455
Published
Jan 28, 2020
Updated
Aug 6, 2024
Vendor
Wikimedia Foundation
Product
MediaWiki
Classifications
CWE-200, T1589
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=1.22.x before 1.22.1
  2. Affected versionversion=1.2x before 1.21.4
  3. Affected versionversion=before 1.19.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · MediaWikiversion=1.22.x before 1.22.1; version=1.2x before 1.21.4; version=before 1.19.10

Published CVSS scores

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

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1589Gather Victim Identity Information

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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