CVE-2020-35623

HIGH
7.5
CVSS Score
Published: December 21, 2020 at 10:37 PM UTC
Updated: June 17, 2026 at 03:14 AM UTC
1 product affected across 1 vendorMediaWiki

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 1.35.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_MISCPatchThird Party Advisory
https://github.com/CWRUChielLab/CASAuth/pull/11
x_refsource_MISCExploitThird Party Advisory
https://phabricator.wikimedia.org/T263498

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-706

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