CVE-2026-8857 Affecting mediawiki-1.45 package, versions <1.45.4-r0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-MEDIAWIKI145-17943780
- published11 Jul 2026
- disclosed1 Jul 2026
Introduced: 1 Jul 2026
CVE-2026-8857 (opens in a new tab)How to fix?
Upgrade Minimos:latest mediawiki-1.45 to version 1.45.4-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mediawiki-1.45 package and not the mediawiki-1.45 package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
A vulnerability in Wikimedia Foundation timeline.
This vulnerability is associated with program files scripts/EasyTimeline.Pl, includes/Timeline.Php.
This issue affects timeline: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
References
- https://www.cve.org/CVERecord?id=CVE-2026-8857
- https://github.com/advisories/GHSA-q6xp-j96f-7vmp
- https://osv.dev/vulnerability/MINI-5v9m-qvmm-969j
- https://osv.dev/vulnerability/CVE-2026-8857
- https://phabricator.wikimedia.org/T426631
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-8857.yaml