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CVE-2026-58034

Stored XSS through a system message when blocking a temporary account that's related to other temporary accounts

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.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
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CVE-2026-58031

Stored i18n XSS in Special:ApiSandbox when a deprecated module is selected

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Special.Apisandbox/ApiSandboxLayout.Js. This issue affects MediaWiki: from 1.46.0-rc.0 before 1.46.0.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
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CVE-2026-58036

Users API leaks whether privileged users have their user groups disabled for lack of 2FA

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Api/ApiQueryAllUsers.Php, includes/Api/ApiQueryUsers.Php, includes/Permissions/PermissionManager.Php, includes/User/UserGroupManager.Php.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
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CVE-2026-58024

API identification of users on private wikis

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Api/ApiUserrights.Php. This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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CVE-2026-58035

Stored XSS through a system message in the codex version of Special:Block

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Special.Block/SpecialBlock.Vue.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
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CVE-2026-58032

mw.Api.getErrorMessage() may return injected HTML if used without errorformat=html

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Api/index.Js. This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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CVE-2026-58029

Full Account Takeover from BotPasswords and OAuth via action=changeauthenticationdata

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Api/ApiChangeAuthenticationData.Php, includes/Api/ApiLinkAccount.Php, includes/Api/ApiRemoveAuthenticationData.Php, includes/Specials/SpecialLinkAccounts.Php, includes/Specials/SpecialUnlinkAccounts.Php. This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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CVE-2026-58519

Stored XSS through Cargo's map format

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS. This issue affects Mediawiki - Cargo Extension: from * before 3.9.1.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
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CVE-2026-34093

Special:UserRights allows viewing user rights from private wiki

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Specials/SpecialUserRights.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS 4.0 · 1.1 Low EPSS < 1% KEV · Not listed
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CVE-2026-34094

Customized help link for page protection indicator is relative to subpage name, because the link target is missing the "/wiki/" prefix

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Page/Article.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS 4.0 · 2 Low EPSS < 1% KEV · Not listed
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CVE-2026-34087

Users API leaks whether privileged users have their user groups disabled for lack of 2FA

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation OATHAuth. This issue affects OATHAuth: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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CVE-2026-34088

RecentChanges entries expose suppressed content via generated log page html

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS 4.0 · 1.3 Low EPSS < 1% KEV · Not listed
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CVE-2026-34090

Suggested investigations: Handle suppressed usernames

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.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
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CVE-2026-34091

User localization leaked by AbuseFilter + EventStream

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS 4.0 · 5.5 Medium EPSS < 1% KEV · Not listed
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CVE-2026-34092

Block UI elements in 'tools'-sidebar shows presence of an autoblocked IP

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Skin/Skin.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
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CVE-2026-34095

action=raw with Special:Mypage subpage title responds with "Content-Type: text/html" on ctype=text/javascript request

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Actions/ActionEntryPoint.Php, includes/Request/FauxResponse.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
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CVE-2025-52738

WordPress Wikipedia Preview plugin <= 1.15.0 - Broken Access Control vulnerability

Missing Authorization vulnerability in Wikimedia Foundation Wikipedia Preview wikipedia-preview allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Wikipedia Preview: from n/a through <= 1.15.0.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
CVE-2008-4408

Cross-site scripting (XSS) vulnerability in MediaWiki 1.13.1, 1.12.0, and possibly other versions before 1.13.2 allows remote attackers to inject arbitrary web script or HTML via the useskin parameter to an unspecified component.

CVSS 2.0 · 4.3 Medium EPSS 1.6% KEV · Not listed
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CVE-2008-1318

Unspecified vulnerability in MediaWiki 1.11 before 1.11.2 allows remote attackers to obtain sensitive "cross-site" information via the callback parameter in an API call for JavaScript Object Notation (JSON) formatted results.

CVSS 2.0 · 5.0 Medium EPSS 1.5% KEV · Not listed
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CVE-2008-0460

Cross-site scripting (XSS) vulnerability in api.php in (1) MediaWiki 1.11 through 1.11.0rc1, 1.10 through 1.10.2, 1.9 through 1.9.4, and 1.8; and (2) the BotQuery extension for MediaWiki 1.7 and earlier; when Internet Explorer is used, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

CVSS 2.0 · 4.3 Medium EPSS 14.6% KEV · Not listed