CVE-2026-0671Public exploitNetwork attack vector

Stored XSS via trusted system-message HTML rendering

Published Jan 8, 2026 · Updated Jan 8, 2026

Stored XSS in Wikimedia Foundation UploadWizard 1.39, 1.43, 1.44, and 1.45 allows remote authenticated users to execute JavaScript. Multiple client-side call sites treat administrator-editable system-message text as trusted HTML, including by wrapping unescaped content in OO.ui.HtmlSnippet. An account with editinterface rights can store script markup that runs in another user's browser when affected upload dialogs or status messages render.

CVSS severity6.1
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Wikimedia Foundation UploadWizard 1.39, 1.43, 1.44, and 1.45 allows remote authenticated users to execute JavaScript. Multiple client-side call sites treat administrator-editable system-message text as trusted HTML, including by wrapping unescaped content in OO.ui.HtmlSnippet. An account with editinterface rights can store script markup that runs in another user's browser when affected upload dialogs or status messages render.

The record

CVE
CVE-2026-0671
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
Wikimedia Foundation
Product
UploadWizard
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.39
  2. Affected versionversion=1.43
  3. Affected versionversion=1.44
  4. Affected versionversion=1.45

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wikimedia Foundation · UploadWizardversion=1.39; version=1.43; version=1.44; version=1.45

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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