Is CVE-2026-100237 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100237 being exploited in the wild.

How severe is CVE-2026-100237?

Medium severity, with a CVSS score of 6.1, published 25 September 2026.

Which products and versions are affected?

Wikimedia Foundation Mediawiki Thanks Extension before 1.43.10, 1.45.5, 1.46.1.

Is there a fix for CVE-2026-100237?

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-2026-100237 attacked?

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

Am I affected by CVE-2026-100237?

Check whether you run Wikimedia Foundation Mediawiki Thanks 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-2026-100237: Wikimedia Foundation Mediawiki Thanks Extension stored XSS

CVE-2026-100237 · Severity: medium · CVSS 6.1 · Published 2026-09-25

The Thanks Extension for Mediawiki, a wiki collaboration platform, contains a stored cross-site scripting (XSS) vulnerability that allows attackers to inject malicious code into web pages viewed by other users. An attacker with the ability to post content on a Mediawiki instance can inject scripts that execute in the browsers of other users, potentially leading to account compromise, session hijacking, or data theft.

Vendors: Wikimedia Foundation.

Quick answers

Is CVE-2026-100237 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100237 being exploited in the wild.
How severe is CVE-2026-100237?: Medium severity, with a CVSS score of 6.1, published 25 September 2026.
Which products and versions are affected?: Wikimedia Foundation Mediawiki Thanks Extension before 1.43.10, 1.45.5, 1.46.1.
Is there a fix for CVE-2026-100237?: 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-2026-100237 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-100237?: Check whether you run Wikimedia Foundation Mediawiki Thanks 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 Thanks Extension for Mediawiki fails to properly neutralize user-supplied input during web page generation, enabling stored XSS attacks. An authenticated attacker can inject malicious scripts via the Thanks feature that persist in the database and execute in the browsers of users who view the affected content. The vulnerability affects versions before 1.43.10, 1.45.5, and 1.46.1.

Affected products

Wikimedia Foundation Mediawiki Thanks Extension before 1.43.10, 1.45.5, 1.46.1

Timeline

2026-09-25: disclosed

References

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