matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms
Priority LOW 19CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-200.
Summary
matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00599 48th percentileScored 2026-11-07
Fix Fixed matrix-appservice-irc (matrix-org): 1.0.1matrix-appservice-irc (npm): 1.0.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| matrix-org | matrix-appservice-irc | before 1.0.1 | 1.0.1 | Patch available | CNA |
| — | matrix-appservice-irc (npm) | before 1.0.1 | 1.0.1 | Patch available | GHSA-c7hh-3v6c-fj4q |
- matrix-appservice-irc Vendormatrix-org Affected before 1.0.1 Fixed in 1.0.1 Patch available CNA
- matrix-appservice-irc (npm) Vendor— Affected before 1.0.1 Fixed in 1.0.1 Patch available GHSA-c7hh-3v6c-fj4q
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:matrix:matrix_irc_bridge:*:*:*:*:*:node.js:*:* | before 1.0.1 | Vulnerable | matrix-org |
- cpe:2.3:a:matrix:matrix_irc_bridge:*:*:*:*:*:node.js:*:* Versions before 1.0.1 Vulnerable ·matrix-org
Remediation
- Fix · CNA matrix-appservice-irc (matrix-org) Fixed in 1.0.1
- Fix · GHSA-c7hh-3v6c-fj4q matrix-appservice-irc (npm) Fixed in 1.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-38700
- 2026-10-03 Alias added: GHSA-c7hh-3v6c-fj4q
References
Patch 1
Advisory 2
More matrix-org Matrix Irc Bridge vulnerabilities
- TI-2023-20039 matrix-appservice-irc IRC command injection via admin commands containing newlines CVSS 3.1CRITICAL 9.8
- TI-2022-18583 Parsing issue in matrix-org/node-irc leading to room takeovers CVSS 3.1HIGH 8.8
- 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
Sources
- CVE-2023-38700 · CVE Program
- CVE-2023-38700 · NVD
- FIRST EPSS
- GHSA-c7hh-3v6c-fj4q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences