Quick answers
- Is CVE-2026-103046 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103046 being exploited in the wild.
- How severe is CVE-2026-103046?
- Informational severity, published 29 September 2026.
- Which products and versions are affected?
- Wikimedia Foundation Mediawiki WikiLambda extension before 1.46.1.
- Is there a fix for CVE-2026-103046?
- 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-2026-103046 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-103046?
- Check whether you run Wikimedia Foundation Mediawiki WikiLambda 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 stored XSS flaw in the WikiLambda extension where user-supplied input is not properly neutralized before being rendered in HTML output. An authenticated or unauthenticated attacker can inject malicious JavaScript that persists server-side and executes when other users view the compromised content. The attack requires the ability to create or modify WikiLambda objects, depending on the wiki's permission model.
Affected products
- Wikimedia Foundation MediaWiki WikiLambda extension before 1.46.1
Timeline
- 2026-09-29: disclosed