Is CVE-2026-58029 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58029 being exploited in the wild.

How severe is CVE-2026-58029?

Informational severity, with a CVSS score of 5.3, published 1 July 2026.

Which products and versions are affected?

Wikimedia Foundation MediaWiki before 1.46.0, 1.45.4, 1.44.6, 1.43.9.

Is there a fix for CVE-2026-58029?

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-2026-58029 attacked?

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

Am I affected by CVE-2026-58029?

Check whether you run 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-2026-58029: Wikimedia Foundation MediaWiki improper authentication in account management components

CVE-2026-58029 · Severity: info · CVSS 5.3 · Published 2026-07-01

A security vulnerability exists in MediaWiki, the software used to power Wikipedia and many other collaborative websites. The flaw is located in the components responsible for managing user accounts and authentication data. If exploited, it could allow an attacker to interfere with how accounts are linked or modified, potentially impacting the integrity of user authentication.

Technologies: Wikimedia Foundation MediaWiki. Vendors: Wikimedia Foundation.

Quick answers

Is CVE-2026-58029 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58029 being exploited in the wild.
How severe is CVE-2026-58029?: Informational severity, with a CVSS score of 5.3, published 1 July 2026.
Which products and versions are affected?: Wikimedia Foundation MediaWiki before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Is there a fix for CVE-2026-58029?: 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-2026-58029 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-58029?: Check whether you run 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

An improper authentication vulnerability (CWE-287) exists in MediaWiki's authentication handling logic. The issue is specifically located within several API modules and Special pages, including ApiChangeAuthenticationData, ApiLinkAccount, ApiRemoveAuthenticationData, SpecialLinkAccounts, and SpecialUnlinkAccounts. The vulnerability requires user interaction (UI:P) and can be triggered over the network. It allows for a partial impact on the confidentiality and integrity of the authentication process. The issue has been addressed in versions 1.46.0, 1.45.4, 1.44.6, and 1.43.9.

Affected products

Wikimedia Foundation MediaWiki before 1.46.0, 1.45.4, 1.44.6, 1.43.9

Timeline

2026-07-01: advisory: NVD published the CVE record.

References

https://phabricator.wikimedia.org/T422676

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