CVE-2025-61649Network attack vector

Privileged block-count disclosure via missing authorization check

Published Feb 3, 2026 · Updated Feb 3, 2026

Information disclosure in Wikimedia Foundation CheckUser allows remote authenticated users to view restricted past-block counts. CheckUserUserInfoCardService counts block-log entries for the UserInfoCard without filtering entries that the requesting account lacks permission to see. High-privilege access and passive interaction with the card are required, and the exposed data is limited to past-block counts.

CVSS severityUnavailable
Unscored
EPSS probability0.33%
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 Wikimedia Foundation CheckUser allows remote authenticated users to view restricted past-block counts. CheckUserUserInfoCardService counts block-log entries for the UserInfoCard without filtering entries that the requesting account lacks permission to see. High-privilege access and passive interaction with the card are required, and the exposed data is limited to past-block counts.

The record

CVE
CVE-2025-61649
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Wikimedia Foundation
Product
CheckUser
Classifications
Unavailable
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 2026Record 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=7cedd58781d261f110651b6af4f41d2d11ae7309 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wikimedia Foundation · CheckUserversion=7cedd58781d261f110651b6af4f41d2d11ae7309 <*

Published CVSS scores

1.1Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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