CVE-2026-27191
MEDIUM
GHSA-ppf9-4ffw-hh4p
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Tags
Description
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://[email protected]#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.
Analysis
Feathersjs versions 5.0.39 and below contain an open redirect vulnerability in the redirect query parameter that fails to properly validate user-supplied values, enabling attackers to inject authority into URLs and steal access tokens through URL manipulation. An unauthenticated remote attacker can exploit this by crafting a malicious redirect URL that causes the victim's browser to send the access token to an attacker-controlled domain, resulting in account takeover. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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