CVE-2023-37899highCWE-754

CVE-2023-37899: high-severity vulnerability in feathersjs feathers

feathersjs socket handler allows abusing implicit toString

Published · Updated

Follow this CVE+ Monitor feathers+ Monitor @feathersjs/socketio

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 1.2%
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Feathers socket handler did not catch invalid string conversion errors like `const message = ${{ toString: '' }}` which would cause the NodeJS process to crash when sending an unexpected Socket.io message like `socket.emit('find', { toString: '' })`. A fix has been released in versions 5.0.8 and 4.5.18. Users are advised to upgrade. There is no known workaround for this vulnerability.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
feathersjs · feathers
Related CVEs — feathersjs feathers

In the same product, most dangerous first.

CVE-2026-29792CRITICALFeathersjs has an OAuth Callback Account TakeoverEPSS 0.6%CVE-2026-27193HIGHFeathers exposes internal headers via unencrypted session cookieEPSS 0.4%CVE-2026-54335LOWFeathersjs: Prototype pollution in @feathersjs/commons _.merge via JSON-parsed __proto__EPSS 0.4%CVE-2026-27191HIGHFeathers: Open Redirect in OAuth callback enables account takeoverEPSS 0.3%CVE-2026-27192HIGHFeathers has an origin validation bypass via prefix matchingEPSS 0.3%