CVE-2024-47824

Malicious homeservers can steal message keys when the matrix-react-sdk user invites another user to a room

HIGH
8.7
CVSS Score
Published: October 15, 2024 at 03:40 PM UTC
Updated: June 17, 2026 at 07:57 AM UTC
2 products affected across 2 vendorsMatrix React SDKMatrix React SDK

Using matrix-react-sdk by matrix-org?

Get instant alerts when new vulnerabilities affect matrix-react-sdk - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH8.7
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

matrix-react-sdk is react-based software development kit for inserting a Matrix chat/VOIP client into a web page. Starting in version 3.18.0 and before 3.102.0, matrix-react-sdk allows a malicious homeserver to potentially steal message keys for a room when a user invites another user to that room, via injection of a malicious device controlled by the homeserver. This is possible because matrix-react-sdk before 3.102.0 shared historical message keys on invite. Version 3.102.0 fixes this issue by disabling sharing message keys on invite by removing calls to the vulnerable functionality. No known workarounds are available.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.102.0
Affected range stops below 3.102.0, so it looks safe — our inference, not a vendor statement
v ≤ 3.102.0v ≤ 3.18.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-200

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card