Is CVE-2026-58028 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58028 being exploited in the wild.

How severe is CVE-2026-58028?

Informational severity, with a CVSS score of 0, published 1 July 2026.

Which products and versions are affected?

Wikimedia Foundation CentralAuth < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9; Wikimedia Foundation MediaWiki < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9.

Is there a fix for CVE-2026-58028?

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-2026-58028 attacked?

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

Am I affected by CVE-2026-58028?

Check whether you run Wikimedia Foundation CentralAuth or Wikimedia Foundation MediaWiki 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-2026-58028: Wikimedia Foundation MediaWiki and CentralAuth XSS

Q: Is there a fix for CVE-2026-58028?

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.

Q: How is CVE-2026-58028 attacked?

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

Q: Am I affected by CVE-2026-58028?

Check whether you run Wikimedia Foundation CentralAuth or Wikimedia Foundation MediaWiki 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-2026-58028 · Severity: info · CVSS 0 · Published 2026-07-01

MediaWiki and its CentralAuth extension are used to power collaborative websites like Wikipedia. A security vulnerability has been identified where the software fails to properly sanitize user input before displaying it on a web page. This could allow an attacker to inject malicious scripts, potentially leading to unauthorized actions or data theft within a user's browser session.

Technologies: Wikimedia Foundation MediaWiki. Vendors: Wikimedia Foundation.

Quick answers

Is CVE-2026-58028 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58028 being exploited in the wild.
How severe is CVE-2026-58028?: Informational severity, with a CVSS score of 0, published 1 July 2026.
Which products and versions are affected?: Wikimedia Foundation CentralAuth < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9; Wikimedia Foundation MediaWiki < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9.
Is there a fix for CVE-2026-58028?: 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-2026-58028 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-58028?: Check whether you run Wikimedia Foundation CentralAuth or Wikimedia Foundation MediaWiki 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 Cross-Site Scripting (XSS) vulnerability exists in MediaWiki and the CentralAuth extension due to improper neutralization of input during web page generation. The flaw is located across several components including API formatting, help modules, and log formatters (specifically in ApiFormatBase.php, ApiHelp.php, Module.php, PageDisplayHookHandler.php, and PermissionChangeLogFormatter.php). An attacker with low privileges could potentially exploit this via the network to execute arbitrary scripts in the context of a user's browser. While the vendor has assigned a CVSS score of 0.0, the vulnerability is categorized as CWE-79. Patches are available in versions 1.46.0, 1.45.4, 1.44.6, and 1.43.9.

Affected products

Wikimedia Foundation MediaWiki < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9
Wikimedia Foundation CentralAuth < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9

Timeline

2026-07-01: disclosed
2026-07-01: advisory

References

https://phabricator.wikimedia.org/T422306

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