CVE-2022-39202Network attack vector

IRC privilege assignment via multi-mode parameter confusion

Published Sep 13, 2022 · Updated Apr 23, 2025

Improper privilege assignment in Matrix.org matrix-appservice-irc before 0.35.0 allows attackers to gain IRC permissions via MODE commands. The underlying matrix-org/node-irc MODE parser consumes parameters for combined mode changes incorrectly, so a permission change can target a different user than the operator intended. Exploitation requires an IRC operator to execute an attacker-suggested multi-mode command, and the bounded consequence is unintended IRC user privileges.

CVSS severity4.3
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege assignment in Matrix.org matrix-appservice-irc before 0.35.0 allows attackers to gain IRC permissions via MODE commands. The underlying matrix-org/node-irc MODE parser consumes parameters for combined mode changes incorrectly, so a permission change can target a different user than the operator intended. Exploitation requires an IRC operator to execute an attacker-suggested multi-mode command, and the bounded consequence is unintended IRC user privileges.

The record

CVE
CVE-2022-39202
Published
Sep 13, 2022
Updated
Apr 23, 2025
Vendor
Matrix.org
Product
matrix-appservice-irc
Classifications
CWE-266, CWE-269, T1098
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 13, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=< 0.35.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Matrix.org · matrix-appservice-ircversion=< 0.35.0

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L
6.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-266Incorrect Privilege Assignment
CWE-269Improper Privilege Management
T1098Account Manipulation

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

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Your stack

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