# CVE-2026-96876: Mediawiki Cargo extension reflected cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-96876-improper-neutralization-of-input-during-web-page-generation-cross  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-25. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-96876 · Severity: info · Published 2026-09-25

The Cargo extension for Mediawiki, which provides data management capabilities for wiki pages, contains a reflected cross-site scripting (XSS) vulnerability. An attacker could craft a malicious link that, when clicked by a wiki user, executes arbitrary JavaScript in the user's browser, potentially stealing session cookies, credentials, or performing unauthorized actions on their behalf.

Vendors: [Wikimedia](https://junglewise.ai/threats/vendors/wikimedia).

## Quick answers

**Is CVE-2026-96876 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96876 being exploited in the wild.

**How severe is CVE-2026-96876?** Informational severity, published 25 September 2026.

**Which products and versions are affected?** Wikimedia Cargo extension through 3.9.4.

**Is there a fix for CVE-2026-96876?** 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-2026-96876 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-96876?** Check whether you run Wikimedia Cargo extension 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 vulnerability is a reflected XSS issue caused by improper neutralization of user-supplied input during web page generation in the Cargo extension. It allows an attacker to inject malicious JavaScript that executes in the context of a victim's browser session without requiring authentication. The flaw affects Cargo extension versions through 3.9.4.

## Affected products

- Wikimedia Cargo extension through 3.9.4

## Timeline

- 2026-09-25: disclosed

## References

- [https://phabricator.wikimedia.org/T435121](https://phabricator.wikimedia.org/T435121)