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.

Classification

CVE ID: CVE-2025-24024

CVSS Base Severity: CRITICAL

CVSS Base Score: 9.1

Affected Products

Vendor: matrix-org

Product: mjolnir

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.98% (scored less or equal to compared to others)

EPSS Date: 2025-02-19 (when was this score calculated)

References

https://github.com/matrix-org/mjolnir/security/advisories/GHSA-3jq6-xc85-m394
https://github.com/matrix-org/mjolnir/commit/b437fa16b5425985715df861987c836affd51eea
https://github.com/matrix-org/mjolnir/commit/d0ef527a9e3eb45e17143d5295a64b775ccaa23d

Timeline