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+---
+gem: google_sign_in
+cve: 2025-58067
+ghsa: 5jch-xhw4-r43v
+url: https://github.com/basecamp/google_sign_in/security/advisories/GHSA-5jch-xhw4-r43v
+title: Google Sign-In for Rails allowed redirect to protocol-relative URI
+date: 2025-08-29
+description: |
+  ## Summary
+
+  It is possible to redirect a user to another origin if the
+  "proceed_to" value in the session store is set to a
+  protocol-relative URL.
+
+  ## Details
+
+  The google_sign_in gem persists an optional URL for redirection
+  after authentication. If this URL is set to a protocol-relative URL,
+  it improperly passes the "same origin" check, and it's possible
+  for the user to be redirected to another origin after authentication,
+  possibly resulting in exposure of authentication information if
+  this attack is chained with other attacks.
+
+  Normally the value of this URL is only written and read by the
+  library or the calling application. However, it may be possible to
+  set this session value from a malicious site with a form submission.
+
+  ## Impact
+
+  Any Rails applications using the google_sign_in gem may be vulnerable,
+  if this vector can be chained with another attack that is able to
+  modify the OAuth2 request parameters.
+
+  ## Workarounds
+
+  No known workarounds.
+
+  ## Credits
+
+  This issue was responsibly reported by Hackerone user
+  [muntrive](https://hackerone.com/muntrive?type=user).
+cvss_v3: 4.2
+patched_versions:
+  - ">= 1.3.1"
+related:
+  url:
+    - https://nvd.nist.gov/vuln/detail/CVE-2025-58067
+    - https://github.com/basecamp/google_sign_in/security/advisories/GHSA-5jch-xhw4-r43v
+    - https://github.com/basecamp/google_sign_in/releases/tag/v1.3.1
+    - https://github.com/basecamp/google_sign_in/pull/75
+    - https://github.com/basecamp/google_sign_in/commit/e97aef4626b1bcbd2c6f01f7dd25f12ac855d4cc
+    - https://github.com/advisories/GHSA-5jch-xhw4-r43v