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MediaWiki Cross-site Scripting (XSS) vulnerability

Moderate severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated May 17, 2024

Package

composer mediawiki/core (Composer)

Affected versions

>= 1.31.0, < 1.31.9
>= 1.32.0, < 1.34.3
>= 1.35.0-rc.0, < 1.35.0

Patched versions

1.31.9
1.34.3
1.35.0

Description

An issue was discovered in MediaWiki before 1.31.9 and 1.32.x through 1.34.x before 1.34.3. The non-jqueryMsg version of mw.message().parse() doesn't escape HTML. This affects both message contents (which are generally safe) and the parameters (which can be based on user input). (When jqueryMsg is loaded, it correctly accepts only whitelisted tags in message contents, and escapes all parameters. Situations with an unloaded jqueryMsg are rare in practice, but can for example occur for Special:SpecialPages on a wiki with no extensions installed.)

References

Published by the National Vulnerability Database Sep 27, 2020
Published to the GitHub Advisory Database May 24, 2022
Reviewed May 17, 2024
Last updated May 17, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(55th percentile)

Weaknesses

CVE ID

CVE-2020-25828

GHSA ID

GHSA-h8qx-mj6v-2934

Source code

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