Wikimedia\Assert\ParameterElementTypeException: Bad value for parameter $preloadParams: all elements must be string
Closed, ResolvedPublicPRODUCTION ERROR
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Assigned To

Authored By

	Reedy
	Mar 14 2025, 10:22 PM

Description

Error

mwversion: 1.44.0-wmf.20
reqId: 2117cb91-a2c2-496a-bc4e-7d65c8ba79d0
Find reqId in Logstash

normalized_message

[{reqId}] {exception_url}   Wikimedia\Assert\ParameterElementTypeException: Bad value for parameter $preloadParams: all elements must be string

Frame	Location	Call
from	/srv/mediawiki/php-1.44.0-wmf.20/vendor/wikimedia/assert/src/Assert.php(164)
#0	/srv/mediawiki/php-1.44.0-wmf.20/includes/editpage/PreloadedContentBuilder.php(75)	Wikimedia\Assert\Assert::parameterElementType(array, array, string)
#1	/srv/mediawiki/php-1.44.0-wmf.20/includes/editpage/EditPage.php(1457)	MediaWiki\EditPage\PreloadedContentBuilder->getPreloadedContent(MediaWiki\Page\PageIdentityValue, MediaWiki\User\User, string, array, string)
#2	/srv/mediawiki/php-1.44.0-wmf.20/includes/editpage/EditPage.php(963)	MediaWiki\EditPage\EditPage->getContentObject()
#3	/srv/mediawiki/php-1.44.0-wmf.20/includes/editpage/EditPage.php(689)	MediaWiki\EditPage\EditPage->displayPermissionStatus(MediaWiki\Permissions\PermissionStatus)
#4	/srv/mediawiki/php-1.44.0-wmf.20/includes/actions/EditAction.php(66)	MediaWiki\EditPage\EditPage->edit()
#5	/srv/mediawiki/php-1.44.0-wmf.20/includes/actions/ActionEntryPoint.php(732)	EditAction->show()
#6	/srv/mediawiki/php-1.44.0-wmf.20/includes/actions/ActionEntryPoint.php(509)	MediaWiki\Actions\ActionEntryPoint->performAction(Article, MediaWiki\Title\Title)
#7	/srv/mediawiki/php-1.44.0-wmf.20/includes/actions/ActionEntryPoint.php(145)	MediaWiki\Actions\ActionEntryPoint->performRequest()
#8	/srv/mediawiki/php-1.44.0-wmf.20/includes/MediaWikiEntryPoint.php(202)	MediaWiki\Actions\ActionEntryPoint->execute()
#9	/srv/mediawiki/php-1.44.0-wmf.20/index.php(58)	MediaWiki\MediaWikiEntryPoint->run()
#10	/srv/mediawiki/w/index.php(3)	require(string)
#11	{main}

Impact

Notes

Details

Request URL: https://en.wikipedia.org/w/index.php?action=edit&preload=*&preloadparams%5B%5D%5B%24eq%5D=*&preloadtitle=*&section=*&title=*

Related Changes in Gerrit:

	Subject	Repo	Branch	Lines +/-
	editpage: Fix exception with non-string 'preloadparams'	mediawiki/core	master	+1 -1
	[POC] Add new WebRequest::getStringArray method	mediawiki/core	master	+24 -15

Customize query in gerrit

Related Objects

Mentioned In: T321359: Use of preloadparams[] on action=edit with values matching the internal array structure of message parameters can result in injection (with display_errors=1) or fatal errors/type errors
Mentioned Here: T321359: Use of preloadparams[] on action=edit with values matching the internal array structure of message parameters can result in injection (with display_errors=1) or fatal errors/type errors

Event Timeline

Reedy created this task.Mar 14 2025, 10:22 PM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 14 2025, 10:22 PM

Reedy moved this task from Untriaged to Mar 2025 on the Wikimedia-production-error board.Mar 15 2025, 1:05 AM

Krinkle moved this task from Mar 2025 to Jan-Mar 2025 on the Wikimedia-production-error board.Apr 1 2025, 2:09 AM

Umherirrender mentioned this in T321359: Use of preloadparams[] on action=edit with values matching the internal array structure of message parameters can result in injection (with display_errors=1) or fatal errors/type errors.Sep 22 2025, 6:55 PM

matmarex subscribed.Sep 22 2025, 8:57 PM

Change #1229187 had a related patch set uploaded (by Bartosz Dziewoński; author: Bartosz Dziewoński):

[mediawiki/core@master] editpage: Fix exception with non-string 'preloadparams'

https://gerrit.wikimedia.org/r/1229187

matmarex claimed this task.Jan 20 2026, 8:53 PM

gerritbot added a project: Patch-For-Review.Jan 20 2026, 8:53 PM

Change #1229597 had a related patch set uploaded (by Thiemo Kreuz (WMDE); author: Thiemo Kreuz (WMDE)):

[mediawiki/core@master] [POC] Add new WebRequest::getStringArray method

https://gerrit.wikimedia.org/r/1229597

Change #1229601 had a related patch set uploaded (by Thiemo Kreuz (WMDE); author: Thiemo Kreuz (WMDE)):

[mediawiki/core@master] Fix WebRequest::getIntArray for multi-dimensional arrays

https://gerrit.wikimedia.org/r/1229601

Change #1229187 merged by jenkins-bot: