What is the CVSS score of CVE-2026-0671?

CVE-2026-0671 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Mediawiki are affected by CVE-2026-0671?

CVE-2026-0671 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users.. A patch is available.

Is there a public PoC exploit available for CVE-2026-0671?

Yes, a public proof-of-concept exploit is available for CVE-2026-0671. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-0671?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Mediawiki CVE-2026-0671

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-08 c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

XSS Mediawiki Mediawiki Extensions Uploadwizard Wikimedia

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 15, 2026 - 21:50 vuln.today

Public exploit code

Patch released

Jan 15, 2026 - 21:50 nvd

Patch available

CVE Published

Jan 08, 2026 - 17:15 nvd

MEDIUM 6.1

DescriptionCVE.org

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.

AnalysisAI

Mediawiki-Extensions-Uploadwizard versions up to 1.39 is affected by cross-site scripting (xss) (CVSS 6.1).

Technical ContextAI

This vulnerability (CWE-79: Cross-site Scripting (XSS)) affects Mediawiki-Extensions-Uploadwizard. 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.

RemediationAI

A vendor patch is available — apply it immediately. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.