Is CVE-2026-103050 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103050 being exploited in the wild.

How severe is CVE-2026-103050?

Informational severity, published 30 September 2026.

Which products and versions are affected?

Wikimedia Foundation Mediawiki MassMessage extension before 1.46.1, 1.45.5, and 1.43.10.

Is there a fix for CVE-2026-103050?

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-2026-103050 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-103050?

Check whether you run Wikimedia Foundation Mediawiki MassMessage 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.

CVE-2026-103050: Mediawiki MassMessage extension stored cross-site scripting

CVE-2026-103050 · Severity: info · Published 2026-09-30

The MassMessage extension for Mediawiki, which is used to send bulk messages across wiki pages, contains a stored cross-site scripting vulnerability. An attacker who can create or edit messages could inject malicious scripts that execute when other users view those messages, potentially compromising accounts or stealing sensitive information.

Vendors: Wikimedia Foundation.

Quick answers

Is CVE-2026-103050 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103050 being exploited in the wild.
How severe is CVE-2026-103050?: Informational severity, published 30 September 2026.
Which products and versions are affected?: Wikimedia Foundation Mediawiki MassMessage extension before 1.46.1, 1.45.5, and 1.43.10.
Is there a fix for CVE-2026-103050?: 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-2026-103050 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-103050?: Check whether you run Wikimedia Foundation Mediawiki MassMessage 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 MassMessage extension fails to properly sanitize user input during web page generation, allowing attackers to inject and store malicious JavaScript code. The vulnerability affects versions before 1.46.1, 1.45.5, and 1.43.10, and requires the ability to create or modify messages in the extension. Patches are available in the patched versions.

Affected products

Wikimedia Foundation Mediawiki MassMessage extension before 1.46.1, 1.45.5, and 1.43.10

Timeline

2026-09-30: disclosed

References

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