CVE-2023-38700 json
matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms
published 2023-08-04 3 y ago modified 2026-06-17 4 mo ago also GHSA-c7hh-3v6c-fj4q , EUVD-2023-2268
- cvss
- 3.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
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.
Patch / fix
- npm matrix-appservice-irc 1.0.1
- matrix matrix_irc_bridge 1.0.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N |
| NVD | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 3.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | matrix-appservice-irc | <1.0.1 |
1.0.1 |
Affected products
- matrix-org matrix-appservice-irc
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/matrix-org/matrix-appservice-irc/commit/8bbd2b69a16cbcbeffdd9b5c973fd89d61498d75
web, patch
-
github.com
/matrix-org/matrix-appservice-irc/security/advisories/GHSA-c7hh-3v6c-fj4q
web, vendor-advisory
-
github.com
/matrix-org/matrix-appservice-irc/releases/tag/1.0.1
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2023-38700
advisory
-
github.com
/matrix-org/matrix-appservice-irc
package
Sources
- CVE List CVE-2023-38700
- GitHub Advisory GHSA-c7hh-3v6c-fj4q
- NVD CVE-2023-38700
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.