What is CVE-2026-0671?

CVE-2026-0671 is a medium-severity vulnerability in Wikimedia Mediawiki-Extensions-Uploadwizard, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-08.

How severe is CVE-2026-0671?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Wikimedia Mediawiki-Extensions-Uploadwizard

CVE-2026-0671

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki - UploadWizard extension allows Cross-Site Scripting (XSS).This issue affects MediaWiki - UploadWizard extension: 1.45, 1.44, 1.43, 1.39.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-01-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (13.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Wikimedia Mediawiki-Extensions-Uploadwizard — versions 1.39, 1.43, 1.44
Wikimedia Foundation MediaWiki - Uploadwizard Extension — versions 1.45, 1.44, 1.43

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Exploit, Issue Tracking, Vendor Advisory)
c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Patch)

Frequently asked questions

What is CVE-2026-0671?: CVE-2026-0671 is a medium-severity vulnerability in Wikimedia Mediawiki-Extensions-Uploadwizard, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-08.
How severe is CVE-2026-0671?: Medium severity. CVSS v3 base score is 6.1 out of 10.