# CVE-2026-103585: Wikimedia MediaSearch XSS vulnerability in HTML tag handling

Source: https://junglewise.ai/threats/cve-2026-103585-improper-neutralization-of-script-related-html-tags-in-a-web  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-103585 · Severity: info · Published 2026-09-30

MediaSearch is an extension for MediaWiki that provides search functionality for wiki content. A cross-site scripting (XSS) vulnerability in the extension fails to properly filter HTML script tags, allowing an attacker to inject malicious scripts. An attacker could exploit this to steal user sessions, deface wiki pages, or perform actions on behalf of logged-in users.

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

## Quick answers

**Is CVE-2026-103585 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103585 being exploited in the wild.

**How severe is CVE-2026-103585?** Informational severity, published 30 September 2026.

**Which products and versions are affected?** Wikimedia Foundation MediaSearch 1.43, 1.45, 1.46.

**Is there a fix for CVE-2026-103585?** 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-2026-103585 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-103585?** Check whether you run Wikimedia Foundation MediaSearch 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 MediaSearch extension improperly neutralizes script-related HTML tags in web page output, enabling reflected or stored cross-site scripting attacks. The vulnerability affects versions 1.43, 1.45, and 1.46. Exploitation requires user interaction to visit a crafted URL or view poisoned content, but carries typical XSS risks of session hijacking and unauthorized actions.

## Affected products

- Wikimedia Foundation MediaSearch 1.43, 1.45, 1.46

## Timeline

- 2026-09-30: disclosed

## References

- [https://gerrit.wikimedia.org/r/q/I79e8200289bd120c3c971ba830776eaae779bb99](https://gerrit.wikimedia.org/r/q/I79e8200289bd120c3c971ba830776eaae779bb99)
- [https://phabricator.wikimedia.org/T435999](https://phabricator.wikimedia.org/T435999)