Is CVE-2026-103051 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103051 being exploited in the wild.

How severe is CVE-2026-103051?

Informational severity, published 30 September 2026.

Which products and versions are affected?

Wikimedia Foundation Mediawiki CentralNotice before 1.46.1, 1.45.5, 1.43.10.

Is there a fix for CVE-2026-103051?

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-2026-103051 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-103051?

Check whether you run Wikimedia Foundation Mediawiki CentralNotice 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-2026-103051: Mediawiki CentralNotice stored cross-site scripting

CVE-2026-103051 · Severity: info · Published 2026-09-30

Mediawiki's CentralNotice extension, which displays sitewide notifications to users, contains a stored cross-site scripting vulnerability. An attacker with sufficient permissions could inject malicious JavaScript that executes in the browsers of all site visitors viewing affected notifications. This could lead to account compromise, credential theft, or malware distribution across the entire wiki.

Vendors: Wikimedia Foundation.

Quick answers

Is CVE-2026-103051 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103051 being exploited in the wild.
How severe is CVE-2026-103051?: Informational severity, published 30 September 2026.
Which products and versions are affected?: Wikimedia Foundation Mediawiki CentralNotice before 1.46.1, 1.45.5, 1.43.10.
Is there a fix for CVE-2026-103051?: 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-2026-103051 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-103051?: Check whether you run Wikimedia Foundation Mediawiki CentralNotice 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

A stored XSS vulnerability exists in the CentralNotice extension due to improper neutralization of user input during web page generation. The vulnerability allows authenticated or privileged attackers to inject malicious scripts that are permanently stored and executed in all users' browsers when viewing central notices. The vulnerability affects versions before 1.46.1, 1.45.5, and 1.43.10, with fixes available in those versions.

Affected products

Wikimedia Foundation Mediawiki CentralNotice before 1.46.1, 1.45.5, 1.43.10

Timeline

2026-09-30: disclosed

References

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