CVE-2020-35480

Debian Security Advisory 4816-1

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se detectó un problema en MediaWiki versiones anteriores a 1.35.1. Una falta de usuarios (cuentas que no existen) y usuarios ocultos (cuentas que se han ocultado explícitamente por ser abusivas o similares) que el visualizador no puede observar son manejadas de forma diferente, exponiendo la información confidencial sobre el estado oculto a los visualizadores sin privilegios. Esto se presenta en varias rutas de código

Multiple security issues were discovered in MediaWiki, a website engine for collaborative work, which could result in cross-site scripting or the disclosure of hidden users.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-16 CVE Reserved
2020-12-18 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-203: Observable Discrepancy

CAPEC

References (4)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC	2023-11-07
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html	2023-11-07
https://www.debian.org/security/2020/dsa-4816	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mediawiki Search vendor "Mediawiki"		Mediawiki Search vendor "Mediawiki" for product "Mediawiki"				< 1.35.1 Search vendor "Mediawiki" for product "Mediawiki" and version " < 1.35.1"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected