An issue was discovered in MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. There is XSS in youhavenewmessagesmanyusers and youhavenewmessages i18n messages. This is related to MediaWiki:Youhavenewmessagesfromusers.

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. The WikibaseMediaInfo component is vulnerable to XSS via the caption fields for a given media file.

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. There is Blind Stored XSS via a URL to the Upload Image feature.

An issue was discovered in the Growth extension in MediaWiki through 1.36.2. On any Wiki with the Mentor Dashboard feature enabled, users can login with a mentor account and trigger an XSS payload (such as alert) via Growthexperiments-mentor-dashboard-mentee-overview-no-js-fallback.

An issue was discovered in the PageTriage 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 the rev-deleted-user, pagetriage-tags-quickfilter-label, pagetriage-triage, pagetriage-filter-date-range-format-placeholder, pagetriage-filter-date-range-to, pagetriage-filter-date-range-from, pagetriage-filter-date-range-heading, pagetriage-filter-set-button, or pagetriage-filter-reset-button message.

An issue was discovered in the Phonos extension in MediaWiki before 1.40.2. PhonosButton.js allows i18n-based XSS via the phonos-purge-needed-error message.

An issue was discovered in the CampaignEvents 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. The Special:EventDetails page allows XSS via the x-xss language setting for internationalization (i18n).

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.

An issue was discovered in MediaWiki before 1.35.9, 1.36.x through 1.38.x before 1.38.5, and 1.39.x before 1.39.1. There is XSS in Wikibase date formatting via wikibase-time-precision-* fields. This allows JavaScript execution by staff/admin users who do not intentionally have the editsitejs capability.

An issue was discovered in the CommentBox extension for MediaWiki through 1.35.2. Via crafted configuration variables, a malicious actor could introduce XSS payloads into various layers.

The RandomGameUnit extension for MediaWiki through 1.35 was not properly escaping various title-related data. When certain varieties of games were created within MediaWiki, their names or titles could be manipulated to generate stored XSS within the RandomGameUnit extension.

An issue was discovered in the DoubleWiki extension for MediaWiki through 1.39.3. includes/DoubleWiki.php allows XSS via the column alignment feature.

The PollNY extension for MediaWiki through 1.35 allows XSS via an answer option for a poll question, entered during Special:CreatePoll or Special:UpdatePoll.

Cross-site scripting (XSS) vulnerability in profileinfo.php in MediaWiki before 1.15.5, when wgEnableProfileInfo is enabled, allows remote attackers to inject arbitrary web script or HTML via the filter parameter.

Cross-site scripting (XSS) vulnerability in the Special:Block implementation in the getContribsLink function in SpecialBlockip.php in MediaWiki 1.14.0 and 1.15.0 allows remote attackers to inject arbitrary web script or HTML via the ip parameter.

Cross-site scripting (XSS) vulnerability in MediaWiki before 1.16.2 allows remote attackers to inject arbitrary web script or HTML via crafted Cascading Style Sheets (CSS) comments, aka "CSS injection vulnerability."

ShortDescription is a MediaWiki extension that provides local short description support. A cross-site scripting (XSS) vulnerability exists in versions prior to 2.3.4. On a wiki that has the ShortDescription enabled, XSS can be triggered on any page or the page with the action=info parameter, which displays the shortdesc property. This is achieved using the wikitext `{{SHORTDESC:<img src=x onerror=alert()>}}`. This issue has a patch in version 2.3.4.

Cross-site scripting (XSS) vulnerability in MediaWiki 1.15 before 1.15.4 and 1.16 before 1.16 beta 3 allows remote attackers to inject arbitrary web script or HTML via crafted Cascading Style Sheets (CSS) strings that are processed as script by Internet Explorer.

An issue was discovered in the ProofreadPage extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. XSS can occur via formatNumNoSeparators.

In MediaWiki through 1.37, the Special:ImportFile URI (aka FileImporter) allows XSS, as demonstrated by the clientUrl parameter.

In MediaWiki through 1.37, Wikibase item descriptions allow XSS, which is triggered upon a visit to an action=info URL (aka a page-information sidebar).

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. Special:CheckUserLog allows CheckUser XSS because of date mishandling, as demonstrated by an XSS payload in MediaWiki:October.

Multiple cross-site scripting (XSS) vulnerabilities in the web-based installer (config/index.php) in MediaWiki 1.6 before 1.6.12, 1.12 before 1.12.4, and 1.13 before 1.13.4, when the installer is in active use, allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In Special:CheckUser, a check of the "get edits" type is vulnerable to HTML injection through the User-Agent HTTP request header.

An issue was discovered in the GoogleAnalyticsMetrics extension for MediaWiki through 1.39.3. The googleanalyticstrackurl parser function does not properly escape JavaScript in the onclick handler and does not prevent use of javascript: URLs.

Mediawiki v1.40.0 does not validate namespaces used in XML files. Therefore, if the instance administrator allows XML file uploads, a remote attacker with a low-privileged user account can use this exploit to become an administrator by sending a malicious link to the instance administrator.

Cross-site scripting (XSS) vulnerability in contrib/cssgen.php in the GeSHi, as used in the SyntaxHighlight_GeSHi extension and MediaWiki before 1.23.10, 1.24.x before 1.24.3, and 1.25.x before 1.25.2, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

MediaWiki before 1.19.24, 1.2x before 1.23.9, and 1.24.x before 1.24.2 does not properly handle when the Zend interpreter xml_parse function does not expand entities, which allows remote attackers to inject arbitrary web script or HTML via a crafted SVG file.

Cross-site scripting (XSS) vulnerability in thumb.php in MediaWiki before 1.23.10, 1.24.x before 1.24.3, and 1.25.x before 1.25.2 allows remote attackers to inject arbitrary web script or HTML via the rel404 parameter, which is not properly handled in an error page.

An issue was discovered in the Growth extension in MediaWiki through 1.36.2. Any admin can add arbitrary JavaScript code to the Newcomer home page footer, which can be executed by viewers with zero edits.

An issue was discovered in CentralAuth in MediaWiki through 1.36.2. The rightsnone MediaWiki message was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript via the setchange log.

An issue was discovered in the GlobalWatchlist extension in MediaWiki through 1.36.2. The rev-deleted-user and ntimes messages were not properly escaped and allowed for users to inject HTML and JavaScript.

An issue was discovered in Special:MediaSearch in the MediaSearch extension in MediaWiki through 1.36.2. The suggestion text (a parameter to mediasearch-did-you-mean) was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript via the intitle: search operator within the query.

An issue was discovered in the Mentor dashboard in the GrowthExperiments extension in MediaWiki through 1.36.2. The Growthexperiments-mentor-dashboard-mentee-overview-add-filter-total-edits-headline, growthexperiments-mentor-dashboard-mentee-overview-add-filter-starred-headline, growthexperiments-mentor-dashboard-mentee-overview-info-text, growthexperiments-mentor-dashboard-mentee-overview-info-legend-headline, and growthexperiments-mentor-dashboard-mentee-overview-active-ago MediaWiki messages were not being properly sanitized and allowed for the injection and execution of HTML and JavaScript.

Cross-site scripting (XSS) vulnerability in the preview in the ExpandTemplates extension for MediaWiki, when $wgRawHTML is set to true, allows remote attackers to inject arbitrary web script or HTML via the wpInput parameter to the Special:ExpandTemplates page.

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Incomplete blacklist vulnerability in includes/upload/UploadBase.php in MediaWiki before 1.19.24, 1.2x before 1.23.9, and 1.24.x before 1.24.2 allows remote attackers to inject arbitrary web script or HTML via an application/xml MIME type for a nested SVG with a data: URI.

Cross-site scripting (XSS) vulnerability in the Scribunto extension for MediaWiki allows remote attackers to inject arbitrary web script or HTML via a function name, which is not properly handled in a Lua error backtrace.

An XSS issue was discovered in the SocialProfile extension in MediaWiki through 1.36. Within several gift-related special pages, a privileged user with the awardmanage right could inject arbitrary HTML and JavaScript within various gift-related data fields. The attack could easily propagate across many pages for many users.

An XSS issue was discovered in the SportsTeams extension in MediaWiki through 1.36. Within several special pages, a privileged user could inject arbitrary HTML and JavaScript within various data fields. The attack could easily propagate across many pages for many users.

An issue was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. The non-jqueryMsg version of mw.message().parse() doesn't escape HTML. This affects both message contents (which are generally safe) and the parameters (which can be based on user input). (When jqueryMsg is loaded, it correctly accepts only whitelisted tags in message contents, and escapes all parameters. Situations with an unloaded jqueryMsg are rare in practice, but can for example occur for Special:SpecialPages on a wiki with no extensions installed.)

A vulnerability, which was classified as problematic, was found in Wikisource Category Browser. This affects an unknown part of the file index.php. The manipulation of the argument lang leads to cross site scripting. It is possible to initiate the attack remotely. The patch is named 764f4e8ce3f9242637df77530c70ae8a2ec4b6a1. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-218415.

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.

MediaWiki 1.21.x, 1.22.x before 1.22.14, and 1.23.x before 1.23.7, when $wgContentHandlerUseDB is enabled, allows remote attackers to conduct cross-site scripting (XSS) attacks by setting the content model for a revision to JS.

Cross-site scripting (XSS) vulnerability in the preview in the TemplateSandbox extension for MediaWiki allows remote attackers to inject arbitrary web script or HTML via the text parameter to Special:TemplateSandbox.

Multiple cross-site scripting (XSS) vulnerabilities in the Listings extension for MediaWiki allow remote attackers to inject arbitrary web script or HTML via the (1) name or (2) url parameter.

Cross-site scripting (XSS) vulnerability in the Hovercards extension for MediaWiki allows remote attackers to inject arbitrary web script or HTML via vectors related to text extracts.

Cross-site scripting (XSS) vulnerability in thumb.php in MediaWiki before 1.19.23, 1.2x before 1.22.15, 1.23.x before 1.23.8, and 1.24.x before 1.24.1 allows remote authenticated users to inject arbitrary web script or HTML via a wikitext message.

The (1) Special:Preferences and (2) Special:UserLogin pages in MediaWiki before 1.19.20, 1.22.x before 1.22.12 and 1.23.x before 1.23.5 allows remote authenticated users to conduct cross-site scripting (XSS) attacks or have unspecified other impact via crafted CSS, as demonstrated by modifying MediaWiki:Common.css.

Cross-site scripting (XSS) vulnerability in MediaWiki before 1.6.11, 1.12.x before 1.12.2, and 1.13.x before 1.13.3, when Internet Explorer is used and uploads are enabled, or an SVG scripting browser is used and SVG uploads are enabled, allows remote authenticated users to inject arbitrary web script or HTML by editing a wiki page.