Is CVE-2026-96877 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-96877 being exploited in the wild.

How severe is CVE-2026-96877?

Informational severity, published 25 September 2026.

Which products and versions are affected?

Wikimedia Cargo extension for MediaWiki through 3.9.4.

Is there a fix for CVE-2026-96877?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-96877 attacked?

It is attacked over the network.

Am I affected by CVE-2026-96877?

Check whether you run Wikimedia Cargo extension for MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-96877: MediaWiki Cargo extension reflected cross-site scripting

CVE-2026-96877 · Severity: info · Published 2026-09-25

The Cargo extension for MediaWiki, which is used to manage structured data in wikis, contains a reflected cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into web pages. An attacker could trick a wiki user into clicking a malicious link to execute arbitrary JavaScript in the victim's browser, potentially stealing session tokens, hijacking accounts, or defacing wiki content.

Vendors: Wikimedia.

Quick answers

Is CVE-2026-96877 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-96877 being exploited in the wild.
How severe is CVE-2026-96877?: Informational severity, published 25 September 2026.
Which products and versions are affected?: Wikimedia Cargo extension for MediaWiki through 3.9.4.
Is there a fix for CVE-2026-96877?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-96877 attacked?: It is attacked over the network.
Am I affected by CVE-2026-96877?: Check whether you run Wikimedia Cargo extension for MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The Cargo extension fails to properly neutralize user input during web page generation, allowing reflected XSS attacks. The vulnerability affects versions through 3.9.4 and is exploitable via network vector without requiring authentication or user interaction beyond clicking a crafted link. An attacker can execute arbitrary JavaScript in the context of the victim's MediaWiki session.

Affected products

Wikimedia Cargo extension for MediaWiki through 3.9.4

Timeline

2026-09-25: disclosed

References

https://phabricator.wikimedia.org/T434977

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