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

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Summary

CVECVE-2026-58034
StatePUBLISHED
Assignerwikimedia-foundation
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-01 15:17:11 UTC
Updated2026-07-01 18:18:24 UTC
DescriptionImproper 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.

Risk And Classification

Primary CVSS: v4.0 0 NONE from c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
4.0c4f26cc8-17ff-4c99-b5e2-38fc1793eaccSecondary0NONECVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS0NONECVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
High
User Interaction
Active
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wikimedia Foundation CheckUser affected 1.46.0-rc.0 1.46.0 semver Not specified

References

ReferenceSourceLinkTags
phabricator.wikimedia.org/T428820 c4f26cc8-17ff-4c99-b5e2-38fc1793eacc phabricator.wikimedia.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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