What’s Vulnerable › Vulnerabilities

CVE-2020-10534

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-12 · updated 2026-06-17
• Weakness: CWE-863

Description

In the GlobalBlocking extension before 2020-03-10 for MediaWiki through 1.34.0, an issue related to IP range evaluation resulted in blocked users re-gaining escalated privileges. This is related to the case in which an IP address is contained in two ranges, one of which is locally disabled.

Affected products

• Wikimedia Foundation MediaWiki: through 1.34.0

References

• https://gerrit.wikimedia.org/r/#/q/I9cc5fb2c08c78bbd797a5fc6d89f4577c8cc118b
• https://phabricator.wikimedia.org/T229731
• https://gerrit.wikimedia.org/r/#/q/I9cc5fb2c08c78bbd797a5fc6d89f4577c8cc118b
• https://phabricator.wikimedia.org/T229731

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