Description
Mjolnir is a moderation tool for Matrix. Mjolnir v1.9.0 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. Version 1.9.1 reverts the feature that introduced the bug, and version 1.9.2 reintroduces the feature safely. Downgrading to version 1.8.3 is recommended if upgrading to 1.9.1 or higher isn't possible.
References (3)
Core 3
Core References
Vendor Advisory x_refsource_confirm
https://github.com/matrix-org/mjolnir/security/advisories/GHSA-3jq6-xc85-m394
Patch x_refsource_misc
https://github.com/matrix-org/mjolnir/commit/b437fa16b5425985715df861987c836affd51eea
Scores
CVSS v3
9.1
EPSS
0.0023
EPSS Percentile
45.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-671
Status
published
Products (1)
matrix-org/mjolnir
= 1.9.0
Published
Jan 21, 2025
Tracked Since
Feb 18, 2026