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CVE-2020-35480

MEDIUM
5.3
CVSS Score
Published: December 18, 2020 at 07:40 AM UTC
Updated: June 17, 2026 at 03:13 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraMediaWiki

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%

Description

An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.

Affected

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

Debian Linux· Debiandrupal
95%
10.09.0
Fedora· Fedora Projectrpm
95%
33
MediaWiki· Mediawiki
95%
v < 1.35.1
Affected range stops below 1.35.1, so it looks safe — our inference, not a vendor statement

References (5)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/
x_refsource_MISCMailing ListRelease NotesVendor Advisory
Source: [email protected]
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
x_refsource_MISCPermissions Required
Source: [email protected]
https://phabricator.wikimedia.org/T120883
Vendor Advisoryx_refsource_DEBIANMailing ListThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2020/dsa-4816

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-203

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