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TI-2022-18583 Aliases CVE-2022-39203GHSA-xvqg-mv25-rwvw

Parsing issue in matrix-org/node-irc leading to room takeovers

Priority MEDIUM 42CWE-269Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-269.

Summary

matrix-appservice-irc is an open source Node.js IRC bridge for Matrix. Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. The vulnerability has been patched in matrix-appservice-irc 0.35.0. As a workaround operators may disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00882 59th percentileScored 2026-11-07
Fix Fixed matrix-appservice-irc (matrix-org): 0.35.0matrix-appservice-irc (npm): 0.35.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
matrix-orgmatrix-appservice-ircbefore 0.35.00.35.0Patch availableCNA
—matrix-appservice-irc (npm)before 0.35.00.35.0Patch availableGHSA-xvqg-mv25-rwvw
  • matrix-appservice-irc Vendormatrix-org Affected before 0.35.0 Fixed in 0.35.0 Patch available CNA
  • matrix-appservice-irc (npm) Vendor— Affected before 0.35.0 Fixed in 0.35.0 Patch available GHSA-xvqg-mv25-rwvw

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:matrix:matrix_irc_bridge:*:*:*:*:*:node.js:*:*before 0.35.0Vulnerablematrix-org
  • cpe:2.3:a:matrix:matrix_irc_bridge:*:*:*:*:*:node.js:*:* Versions before 0.35.0 Vulnerable ·matrix-org

Remediation

  • Fix · CNA matrix-appservice-irc (matrix-org) Fixed in 0.35.0
  • Fix · GHSA-xvqg-mv25-rwvw matrix-appservice-irc (npm) Fixed in 0.35.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-39203
  2. 2026-10-03 Alias added: GHSA-xvqg-mv25-rwvw

References

Advisory 3

Other 2

  • TI-2023-20039 matrix-appservice-irc IRC command injection via admin commands containing newlines CVSS 3.1CRITICAL 9.8
  • TI-2022-11710 Improper handling of multiline messages in matrix-appservice-irc CVSS 3.1HIGH 8.8
  • TI-2022-18582 IRC mode parameter confusion in matrix-appservice-irc CVSS 3.1MEDIUM 6.3
  • TI-2022-03640 matrix-appservice-irc PgDataStore.ts sql injection CVSS 3.1MEDIUM 5.6
  • TI-2025-20003 Matrix IRC Bridge allows IRC command injection to own puppeted user CVSS 3.1MEDIUM 4.3
  • TI-2023-20048 matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms CVSS 3.1LOW 3.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences