CVE-2023-38700

lowpriority · track · 15EPSS 0.006 · 48 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.60% (48th) EPSS

CVSS 3.7 · low

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

3.7

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.13.7lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 1.4

v3.13.5lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:Nsecondary · ENISA EU

v3.13.5lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:Nsecondary · security-advisories@github.comexploitability 1.8 · impact 1.4

v3.13.5lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:Nsecondary · OSV

v3.13.4lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-200USCWE-200US

affected products (3)

Products and version ranges known to be affected.

matrix-org matrix-appservice-irc≤ < 1.0.1enisa_euvdEU
matrix matrix irc bridge< 1.0.1nvdUScpe:2.3:a:matrix:matrix_irc_bridge:*:*:*:*:*:*:*:*
npm matrix-appservice-irc< 1.0.1osvUSpkg:npm/matrix-appservice-irc

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-c7hh-3v6c-fj4qmatrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms2023-08-04ghsa · osvUS
### Impact 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. ### Patches Please upgrade to 1.0.1. ### Workarounds You can set the `matrixHandler.eventCacheSize` config value to `0` to workaround this bug. However, this may impact performance. ### Credits Discovered and reported by [Val Lorentz](https://valentin-lorentz.fr/). ### For more information If you have any questions or comments about this advisory email us at [security@matrix.org](mailto:security@matrix.org).

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2023-08-04modified 2026-06-17

references (10)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan