Open Redirect
CVE-2026-27191
MEDIUM
GHSA-ppf9-4ffw-hh4p
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
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://target.com@attacker.com#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.
AnalysisAI
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. A patch is available for affected installations.
Technical ContextAI
Classified as CWE-601 (URL Redirection to Untrusted Site (Open Redirect)). Affects the with the user-supplied redirect component of Feathers. 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-supplie
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 5.0.40.. Restrict network access to the affected service where possible.
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