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CVE-2020-35475

Date: December 18, 2020

In MediaWiki before 1.35.1, the messages userrights-expiry-current and userrights-expiry-none can contain raw HTML. XSS can happen when a user visits Special:UserRights but does not have rights to change all userrights, and the table on the left side has unchangeable groups in it. (The right column with the changeable groups is not affected and is escaped correctly.)

Language: PHP

Severity Score

Related Resources (9)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/
https://www.debian.org/security/2020/dsa-4816
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/
https://phabricator.wikimedia.org/T268917
https://security-tracker.debian.org/tracker/CVE-2020-35475
https://nvd.nist.gov/vuln/detail/CVE-2020-35475
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-35475
https://www.mend.io/vulnerability-database/CVE-2020-35475

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Improper Encoding or Escaping of Output

CWE-116

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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