CVE-2022-36009Network attack vector

Incorrect event authorization via misnamed JSON field

Published Aug 19, 2022 · Updated Apr 23, 2025

Incorrect authorization in Matrix.org gomatrixserverlib before commit 723fd49 allows remote authenticated users to submit or block room events. NewPowerLevelContentFromEvent unmarshals m.room.power_levels through a struct tagged event_default instead of events_default, so the configured value is ignored and replaced by zero. Exploitation requires a room whose events_default differs from zero; affected Dendrite servers can then accept unauthorized events or reject authorized ones.

CVSS severity5.0
Medium
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect authorization in Matrix.org gomatrixserverlib before commit 723fd49 allows remote authenticated users to submit or block room events. NewPowerLevelContentFromEvent unmarshals m.room.power_levels through a struct tagged event_default instead of events_default, so the configured value is ignored and replaced by zero. Exploitation requires a room whose events_default differs from zero; affected Dendrite servers can then accept unauthorized events or reject authorized ones.

The record

CVE
CVE-2022-36009
Published
Aug 19, 2022
Updated
Apr 23, 2025
Vendor
Matrix.org
Product
gomatrixserverlib
Classifications
CWE-863, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.9.3 for dendrite
  2. Affected versionversion=< 723fd49 for gomatrixserverlib

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Matrix.org · gomatrixserverlibversion=< 0.9.3 for dendrite; version=< 723fd49 for gomatrixserverlib

Published CVSS scores

5.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
8.8NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo