CVE-2026-27193: Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript

Routine

MEDIUM 5.3UPGRADE

CVE-2026-27193 is a medium-severity flaw (CVSS 5.3) affecting feathers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In versions 5.0.39 and below, all HTTP request headers are stored in the session cookie, which is signed but not encrypted, exposing internal proxy/gateway headers to clients. The OAuth service stores the complete headers object in the session, then the session is persisted using cookie-session, which base64-encodes the data. While the cookie

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-02-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: feathersjs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-21 05:17 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

feathersjs feathers UPGRADE

Affected: < 5.0.40

Fixed in: 5.0.40

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls feathers

2. UPGRADE to 5.0.40

npm install feathers@">=5.0.40"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27193?

feathers: upgrade to 5.0.40. Exact commands for each OS are on this page.

Is CVE-2026-27193 being exploited?

CVE-2026-27193 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27193 affect?

CVE-2026-27193 affects feathers. Severity is medium (CVSS 5.3). Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. In versions 5.0.39 and below, all HTTP request headers are stored in the session cookie, which is signed but not encrypted, exposing i

How urgent is CVE-2026-27193?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2026-29793 CRITICAL 9.8 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript
CVE-2026-29792 CRITICAL 9.8 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript
CVE-2026-27192 HIGH 8.1 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript
CVE-2026-27191 MEDIUM 6.1 UPGRADE Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript

References

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