# CVE-2026-103049: Wikimedia MediaWiki Cargo reflected cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-103049-improper-neutralization-of-input-during-web-page-generation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-103049 · Severity: info · Published 2026-09-30

The Cargo extension for MediaWiki, a popular open-source wiki platform, contains a reflected cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into web pages. An attacker could craft a malicious link and trick a user into clicking it, leading to session hijacking, credential theft, or defacement of wiki content.

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

## Quick answers

**Is CVE-2026-103049 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103049 being exploited in the wild.

**How severe is CVE-2026-103049?** Informational severity, published 30 September 2026.

**Which products and versions are affected?** Wikimedia Foundation MediaWiki Cargo before 1.46.1.

**Is there a fix for CVE-2026-103049?** 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-2026-103049 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-103049?** Check whether you run Wikimedia Foundation MediaWiki Cargo 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

This is a reflected XSS vulnerability in the Cargo extension for MediaWiki caused by improper input sanitization during web page generation. The attack requires user interaction (clicking a malicious link) and operates over the network. An attacker can execute arbitrary JavaScript in the victim's browser within the context of the wiki application.

## Affected products

- Wikimedia Foundation MediaWiki Cargo before 1.46.1

## Timeline

- 2026-09-30: disclosed

## References

- [https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1310132](https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1310132)
- [https://phabricator.wikimedia.org/T431567](https://phabricator.wikimedia.org/T431567)