Cross-Site Scripting Vulnerability in Wikimedia Foundation MediaWiki UploadWizard Extension
CVE-2026-100381

5.3MEDIUM

Key Information:

Vendor

Wikimedia Foundation

Status
Mediawiki - Uploadwizard Extension
Vendor
CVE Published:
25 September 2026

What is CVE-2026-100381?

The MediaWiki UploadWizard Extension by Wikimedia Foundation is vulnerable to Cross-Site Scripting (XSS) due to improper input neutralization during webpage generation. This can allow attackers to execute arbitrary scripts in the context of users’ browsers, potentially compromising user data and privacy. This issue affects specific versions of the UploadWizard Extension, making it imperative for users to update to the latest releases to mitigate the risk.

Affected Version(s)

Mediawiki - UploadWizard Extension * < 1.46.1, 1.45.5, 1.43.10

References

https://phabricator.wikimedia.org/T434619
https://gerrit.wikimedia.org/r/q/Iba914c0d7e86f9342ee9cec...

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Marco Paciaroni (bombobombone)
.