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CVE-2026-8857

Mediawiki code injection

8.8 HIGHPublic exploitEPSS 2.10%
  1. Published1 Jul 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Mediawiki≥ 1.43.0 < 1.43.9 · ≥ 1.44.0 < 1.44.6 · ≥ 1.45.0 < 1.45.4

Remediation

Fixed in
Mediawiki≥ 1.43.9

References

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Frequently asked

Is CVE-2026-8857 being actively exploited?

CVE-2026-8857 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 2.10%.

How severe is CVE-2026-8857?

CVE-2026-8857 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 2.10% probability of exploitation.

Which products are affected by CVE-2026-8857?

Affected products include Mediawiki.

How do I fix CVE-2026-8857?

Upgrade affected software to a fixed version, for example Mediawiki 1.43.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-8857 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.