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Mjolnir 1.9.0 accepts commands from any room

Critical
turt2live published GHSA-3jq6-xc85-m394 Jan 21, 2025

Package

mjolnir

Affected versions

1.9.0

Patched versions

1.9.1

Description

Impact

Mjolnir 1.9.0 responds to management commands from any room the bot is member of. This can allow users who aren't operators of the bot to use the bot's functions, including server administration components if enabled.

Patches

Version 1.9.1 reverts the feature that introduced the bug, and version 1.9.2 reintroduces the feature safely.

Workarounds

Downgrading to version 1.8.3 is recommended if upgrading to 1.9.1 or higher isn't possible.

References

N/A

For more information

If you have any questions or comments about this advisory, please email us at security at matrix.org.

Severity

Critical

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
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

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:N/S:U/C:N/I:H/A:H

CVE ID

CVE-2025-24024

Weaknesses