Improper input validation in MediaWiki
CVE-2020-35623
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000
Affected products
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T263498 (Exploit, Third Party Advisory)
- github.com/CWRUChielLab/CASAuth/pull/11 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-35623?
- CVE-2020-35623 is a high-severity vulnerability in MediaWiki, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-12-21.
- How severe is CVE-2020-35623?
- High severity. CVSS v3 base score is 7.5 out of 10.