CVE-2025-62663Public exploitNetwork attack vector

Stored XSS via raw system-message HTML

Published Oct 18, 2025 · Updated Oct 20, 2025

Stored cross-site scripting in Wikimedia Foundation UploadWizard before 1.39 allows attackers to execute scripts in users' browsers. The client interface inserts an editable MediaWiki system message directly as HTML instead of processing it through the message parser. The stored payload requires control of a MediaWiki system message and executes when the affected UploadWizard interface displays that message.

CVSS severity6.9
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Wikimedia Foundation UploadWizard before 1.39 allows attackers to execute scripts in users' browsers. The client interface inserts an editable MediaWiki system message directly as HTML instead of processing it through the message parser. The stored payload requires control of a MediaWiki system message and executes when the affected UploadWizard interface displays that message.

The record

CVE
CVE-2025-62663
Published
Oct 18, 2025
Updated
Oct 20, 2025
Vendor
Wikimedia Foundation
Product
UploadWizard
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=master <1.39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · UploadWizardversion=master <1.39

Published CVSS scores

6.9Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter: JavaScript

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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