What’s Vulnerable › Vulnerabilities

CVE-2020-35623

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-21 · updated 2026-06-17
• Weakness: CWE-20

Description

An issue was discovered in the CasAuth extension for MediaWiki through 1.35.1. Due to improper username validation, it allowed user impersonation with trivial manipulations of certain characters within a given username. An ordinary user may be able to login as a "bureaucrat user" who has a similar username, as demonstrated by usernames that differ only in (1) bidirectional override symbols or (2) blank space.

Affected products

• Wikimedia Foundation MediaWiki: through 1.35.1

References

• https://github.com/CWRUChielLab/CASAuth/pull/11
• https://phabricator.wikimedia.org/T263498
• https://github.com/CWRUChielLab/CASAuth/pull/11
• https://phabricator.wikimedia.org/T263498

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