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EUVD-2026-342162

fkie_cve-2026-54605

OAuth is a Ruby wrapper for the OAuth 1.0 and 1.0a protocols, providing clients and servers. From 0.5.5 to 1.1.5, OAuth::Consumer#token_request parses the raw Location header of a 300 to 399 redirect returned by the OAuth server and follows the redirect recursively, which can mutate the consumer's configuration and expose signed OAuth request metadata, including the Authorization header, to a cross-origin host. This issue is fixed in version 1.1.6.

GHSA-prq8-7wvh-44qh — OAuth: Cross-origin token-request redirects can expose signed request metadata

Affected: RubyGems: oauth

# Cross-origin OAuth token-request redirects can expose signed request metadata

## Summary

When an application uses `OAuth::Consumer` to request OAuth 1.0 request tokens or access tokens, the token request helper follows `300..399` redirects returned by the OAuth server. In affected versions, `OAuth::Consumer#token_request` parses the raw `Location` header, follows the redirect recursively, and can mutate the consumer's configured `site` when the redirect points to a different host with the same path.

The result is a cross-origin signed-request disclosure primitive: if an OAuth server token endpoint returns a redirect whose target an attacker controls, the client can re-sign the token request and send OAuth 1.0 request metadata, including the OAuth signature, nonce, timestamp, consumer key, and any request parameters included in the signature base string, to the attacker-controlled host. The same behavior can also be used as an SSRF or confused-deputy primitive because the application server follows the redirect and sends the next request from its own network position.

## Affected

- `oauth` v1.1.5 and prior versions back to and including v0.5.5. - The cross-host token redirect behavior was introduced by https://github.com/ruby-oauth/oauth/commit/d74b767f - The behavior is documented in the v0.5.5 changelog as "Allow redirect to different host but same path". - The vulnerable behavior is in `OAuth::Consumer#token_request`, which is used by the documented re…

UBUNTU-CVE-2026-54605

Affected: Ubuntu:16.04:LTS: ruby-oauth, Ubuntu:18.04:LTS: ruby-oauth, Ubuntu:20.04:LTS: ruby-oauth, Ubuntu:22.04:LTS: ruby-oauth, Ubuntu:24.04:LTS: ruby-oauth, Ubuntu:26.04:LTS: ruby-oauth