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CVE-2026-22711

Stored XSS through system messages in WikiLove

Improper neutralization of alternate XSS syntax vulnerability in The Wikimedia Foundation Mediawiki - Wikilove Extension allows Cross-Site Scripting (XSS).The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki-wikilove Extension
CVE-2026-5762

ReportIncident DiscussionTools integration causes slow requests

Allocation of resources without limits or throttling vulnerability in Wikimedia Foundation MediaWiki - ReportIncident Extension allows HTTP DoS. This issue was remediated only on the `master` branch.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki-reportincident Extension
CVE-2026-39838

ProofreadPage improperly sanitizes multiline styles using Sanitizer::checkCSS

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki-proofreadpage Extension
CVE-2026-39937

Global vanishing does not completely remove user email

Improper removal of sensitive information before storage or transfer vulnerability in The Wikimedia Foundation Mediawiki - CentralAuth Extension allows Resource Leak Exposure. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki - Centralauth Extension
CVE-2026-39933

Multiple XSS vulnerabilities in GlobalWatchlist

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - GlobalWatchlist Extension allows Cross-Site Scripting (XSS). The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki - Globalwatchlist Extension
CVE-2026-39934

Growth Experiments ReassignMenteesJob runs as an infinite loop

Loop with unreachable exit condition ('infinite loop') vulnerability in The Wikimedia Foundation Mediawiki - GrowthExperiments Extension allows Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions. This issue was remediated only on the `master` branch.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki-growthexperiments Extension
CVE-2026-39935

XSS-via-i18n in localised wiki names

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - CampaignEvents Extension allows Cross-Site Scripting (XSS). This issue was remediated only on the `master` branch.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki-campaignevents Extension
CVE-2026-39936

Stored XSS in Score due to usage of non-reserved data attributes

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - Score Extension allows Cross-Site Scripting (XSS). The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wikimedia
Products
Mediawiki-score Extension
CVE-2025-61641

API list=allpages with maxsize is making really slow queries

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/api/ApiQueryAllPages.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 1.7 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61642

Stored XSS through system messages provided to CodexHtmlForms

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 includes/htmlform/CodexHTMLForm.Php, includes/htmlform/fields/HTMLButtonField.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61643

EventStreams publishes suppressed recent change entries that are suppressed from their creation

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/recentchanges/RecentChangeRCFeedNotifier.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 2.7 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-11261

Stored i18n XSS exposed by security patch for T402077

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.Language/mediawiki.Language.Js. This issue affects MediaWiki: from * before 1.39.15, 1.43.5, 1.44.2.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61646

Watchlist group mode reveals authors of edits with hidden authorship

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/RecentChanges/EnhancedChangesList.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 1.2 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61634

HTML rest endpoint needs PoolCounter and proper parser cache check

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Rest/Handler/PageHTMLHandler.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61636

Codex Special:Block vulnerable to message key XSS

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 includes/htmlform/fields/HTMLButtonField.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61637

Stored XSS through system messages in MW Core

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.Action/mediawiki.Action.Edit.Preview.Js, resources/src/mediawiki.Page.Preview.Js. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61638

Sanitizer::validateAttributes data-XSS

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki, Wikimedia Foundation Parsoid. This vulnerability is associated with program files includes/parser/Sanitizer.Php, src/Core/Sanitizer.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1; Parsoid: from * before 0.16.6, 0.20.4, 0.21.1.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Parsoid
CVE-2025-61639

Suppressed blocked IP is visible in Special:BlockList, RC, and other places

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/logging/ManualLogEntry.Php, includes/recentchanges/RecentChangeFactory.Php, includes/recentchanges/RecentChangeStore.Php. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 1.7 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61640

Stored XSS through system messages in Special:RecentChangesLinked (MW Core)

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.Rcfilters/ui/RclToOrFromWidget.Js. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki
CVE-2025-61645

CodexTablePager has i18n XSS

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 includes/pager/CodexTablePager.Php. This issue affects MediaWiki: from * before 1.44.1.

CVSS 4.0 · 0 Low EPSS < 1% KEV · Not listed
Vendors
Mediawiki Wikimedia
Products
Mediawiki Mediawiki