CVE-2026-0671: Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in W

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-0671 is a medium-severity flaw (CVSS 6.1) affecting mediawiki-extensions-uploadwizard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-01-08
Last modified	2026-10-26

Publisher (CNA): wikimedia-foundation · Vendor: wikimedia

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-08 17:15 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

wikimedia mediawiki-extensions-uploadwizard DOWNGRADE

Affected: 1.39 · 1.43 · 1.44 · 1.45

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.39

1. Check installed version

apt-cache policy mediawiki-extensions-uploadwizard || rpm -q mediawiki-extensions-uploadwizard || mediawiki-extensions-uploadwizard --version

2. No fixed release: DOWNGRADE to a release before 1.39 (Debian / Ubuntu)

apt-cache madison mediawiki-extensions-uploadwizard sudo apt install mediawiki-extensions-uploadwizard=<VERSION_BEFORE_1.39> sudo apt-mark hold mediawiki-extensions-uploadwizard

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mediawiki-extensions-uploadwizard sudo dnf downgrade mediawiki-extensions-uploadwizard-<VERSION_BEFORE_1.39> sudo dnf versionlock add mediawiki-extensions-uploadwizard

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-0671?

mediawiki-extensions-uploadwizard: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-0671 being exploited?

CVE-2026-0671 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-0671 affect?

CVE-2026-0671 affects mediawiki-extensions-uploadwizard. Severity is medium (CVSS 6.1). 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 - UploadWiza

How urgent is CVE-2026-0671?

Priority 30/100. Public exploit reference

References

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