# CVE-2026-58025: Wikimedia Foundation MediaWiki deserialization in WikiImporter

Source: https://junglewise.ai/threats/cve-2026-58025-wikimedia-foundation-mediawiki-deserialization-in-wikiimporter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-01. Updated: 2026-07-01  
License: CC BY 4.0 with a link back

CVE-2026-58025 · Severity: info · CVSS 5.9 · Published 2026-07-01

MediaWiki, the software powering Wikipedia and many other wikis, contains a security flaw in how it handles imported data and log entries. An attacker with high-level administrative privileges could potentially execute unauthorized code or manipulate system data by providing specially crafted malicious files. This could lead to a partial loss of data integrity or unauthorized changes to the wiki platform.

Technologies: [Wikimedia Foundation MediaWiki](https://junglewise.ai/threats/technologies/mediawiki). Vendors: [Wikimedia Foundation](https://junglewise.ai/threats/vendors/wikimedia-foundation).

## Quick answers

**Is CVE-2026-58025 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58025 being exploited in the wild.

**How severe is CVE-2026-58025?** Informational severity, with a CVSS score of 5.9, published 1 July 2026.

**Which products and versions are affected?** Wikimedia Foundation MediaWiki < 1.46.0, < 1.45.4, < 1.44.6, < 1.43.9.

**Is there a fix for CVE-2026-58025?** 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-2026-58025 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-58025?** 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 deserialization of untrusted data vulnerability (CWE-502) exists in MediaWiki within the WikiImporter, WikiRevision, and LogEntryBase components. The flaw is rooted in the improper handling of serialized objects during import and logging operations, potentially leading to code injection (CWE-94). Exploitation requires network access and high privileges (PR:H), with a high complexity (AC:H) due to the specific conditions needed to trigger the deserialization chain. Successful exploitation allows for partial impact on confidentiality and availability, and high impact on integrity. The issue is addressed 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

## Timeline

- 2026-07-01: advisory: CVE-2026-58025 published by Wikimedia Foundation

## References

- [https://phabricator.wikimedia.org/T422244](https://phabricator.wikimedia.org/T422244)

## Related threats

- [Mediawiki Wikibase Extension stored cross-site scripting](https://junglewise.ai/threats/cve-2026-100245-improper-neutralization-of-input-during-web-page-generation-xss)
- [Wikimedia Mediawiki UploadWizard DOM XSS in Flickr titles](https://junglewise.ai/threats/cve-2026-100381-improper-neutralization-of-input-during-web-page-generation-xss)
- [MediaWiki Wikibase reflected XSS in Special:SetLabel](https://junglewise.ai/threats/cve-2026-100380-improper-neutralization-of-input-during-web-page-generation-xss)
- [Wikimedia Foundation MediaWiki XSS in Logging and Special Pages](https://junglewise.ai/threats/cve-2026-58037-wikimedia-foundation-mediawiki-xss-in-logging-and-special-pages)
- [Wikimedia Foundation MediaWiki Information Exposure in User API](https://junglewise.ai/threats/cve-2026-58036-wikimedia-foundation-mediawiki-information-exposure-in-user-api)