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Active filters (1):Package: pkg:github/wikimedia/checkuser

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Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/blockConnectedTempAccountsField.Vue. This issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.

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Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affects CheckUser: from 1.45.0 before 1.45.2.

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Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files src/GlobalContributions/GlobalContributionsPager.Php. This issue affects CheckUser: from * before 1.43.4, 1.44.1.

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CVE-2025-61650 is a low-severity Cross-site Scripting (XSS) vulnerability in the Wikimedia Foundation's CheckUser tool, specifically in the CheckUserUserInfoCardService.php file. It involves improper neutralization of input during web page generation, allowing potentially malicious scripts to be executed in the context of users with high privileges. The vulnerability affects all versions prior to commit 795bf333272206a0189050d975e94b70eb7dc507. Exploitation requires privileged access and user interaction, limiting its impact. No known exploits are currently in the wild. While the CVSS score is low (1.1), the vulnerability could be leveraged in targeted attacks against administrators or trusted users. European organizations using Wikimedia's CheckUser tool should monitor for patches and apply them promptly. Mitigation includes strict input validation, output encoding, and restricting access to the CheckUser interface.

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An issue was discovered in the CheckUser extension in MediaWiki before 1.35.14, 1.36.x through 1.39.x before 1.39.6, and 1.40.x before 1.40.2. XSS can occur via message definitions.e.g., in SpecialCheckUserLog.

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