CVE-2026-0671 Multiple stored i18n/message-key XSSes in UploadWizard
Attackers can inject malicious scripts via i18n message keys in UploadWizard, potentially executing code or hijacking user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-0671?
CVE-2026-0671 is a medium-severity cross-site scripting vulnerability in Wikimedia Foundation MediaWiki - UploadWizard extension, published on 8 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-0671?
It affects 1 product.
Products include Wikimedia Mediawiki-Extensions-Uploadwizard.
How do I fix CVE-2026-0671?
No fix has been published for CVE-2026-0671 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-0671 being exploited?
There is no known exploitation of CVE-2026-0671 in the wild and no public exploit code.
Sources
Also known as GHSA-79p6-j87f-jqp9.