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CVE-2018-10101

MEDIUM severity · CVSS 6.1 · CWE-601
6.1CVSS MEDIUM

Summary

Before WordPress 4.9.5, the URL validator assumed URLs with the hostname localhost were on the same host as the WordPress server.

Impact & exploitability

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
Confidentiality impactLow
Integrity impactLow
Availability impactNone
Exploit probability (EPSS)9%

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://core.trac.wordpress.org/changeset/42894 ↗

Last checked: Wed, 10 Jun 2026 22:18:30 UTC