GHSA-9m9c-vpv5-9g85

Source

https://github.com/advisories/GHSA-9m9c-vpv5-9g85

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-9m9c-vpv5-9g85/GHSA-9m9c-vpv5-9g85.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-9m9c-vpv5-9g85

Aliases

CVE-2026-27193

Published

2026-02-19T20:32:37Z

Modified

2026-02-23T23:43:57.119633Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Feathers exposes internal headers via unencrypted session cookie

Details

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:

// https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/service.ts#L173
session.headers = headers;

The session is persisted using cookie-session, which base64-encodes the data. While the cookie is signed to prevent tampering, the contents are readable by anyone by simply decoding the base64 value.

Under specific deployment configurations (e.g., behind reverse proxies or API gateways), this can lead to exposure of sensitive internal infrastructure details such as API keys, service tokens, and internal IP addresses.

Credits: Abdelwahed Madani Yousfi (@vvxhid) / Edoardo Geraci (@b0-n0-b0) / Thomas Rinsma (@ThomasRinsma) From Codean Labs.

Database specific

{
    "nvd_published_at": "2026-02-21T05:17:28Z",
    "github_reviewed_at": "2026-02-19T20:32:37Z",
    "cwe_ids": [
        "CWE-200"
    ],
    "severity": "HIGH",
    "github_reviewed": true
}

References

Affected packages

npm / @feathersjs/authentication-oauth

Package

Name: @feathersjs/authentication-oauth; View open source insights on deps.dev
Purl: pkg:npm/%40feathersjs/authentication-oauth

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.0.40

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-9m9c-vpv5-9g85/GHSA-9m9c-vpv5-9g85.json"

last_known_affected_version_range

"<= 5.0.39"