Skip to content

Arbitrary HTML injection in discourse-mermaid-theme-component

Moderate
jomaxro published GHSA-8437-hgcm-p3q3 Jan 4, 2023

Package

discourse-mermaid-theme-component (Discourse)

Affected versions

1.0.0

Patched versions

1.1.0

Description

Impact

Users that can create posts are able to inject arbitrary HTML on that post.

Patches

The issue has been fixed on the main branch. Admins can update the theme component through the admin UI (Customize -> Themes -> Components -> discourse-mermaid-theme-component -> Check for Updates)

Workarounds

Alternatively, admins can temporarily disable discourse-mermaid-theme-component.

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
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
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:L/UI:N/S:C/C:L/I:N/A:N

CVE ID

CVE-2022-46180

Weaknesses

No CWEs

Credits