Quick answers
- Is CVE-2026-58031 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-58031 being exploited in the wild.
- How severe is CVE-2026-58031?
- Informational severity, with a CVSS score of 0, published 1 July 2026.
- Which products and versions are affected?
- Wikimedia Foundation MediaWiki 1.46.0-rc.0 to 1.46.0.
- Is there a fix for CVE-2026-58031?
- 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-2026-58031 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-58031?
- 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
A cross-site scripting (XSS) vulnerability exists in MediaWiki's ApiSandboxLayout.js component. The flaw is caused by improper neutralization of input during web page generation within the Special:ApiSandbox interface. An attacker with basic user privileges (PR:L) could potentially inject malicious scripts that execute in the context of another user's session, provided there is user interaction (UI:P). The vulnerability specifically affects versions 1.46.0-rc.0 through 1.46.0. While the CNA has assigned a CVSS score of 0.0, the vulnerability is tracked as CWE-79.
Affected products
- Wikimedia Foundation MediaWiki 1.46.0-rc.0 to 1.46.0
Timeline
- 2026-07-01: advisory: NVD publication date