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CVE-2025-57821

4.2 · MEDIUM

Basecamp's Google Sign-In adds Google sign-in to Rails applications.

Published Aug 27, 2025CWE-601EPSS 0.24%

Overview

CVE-2025-57821 is a medium-severity vulnerability. It was published on August 27, 2025 and has a CVSS 3.1 base score of 4.2 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.2, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Basecamp's Google Sign-In adds Google sign-in to Rails applications. Prior to version 1.3.0, it is possible to craft a malformed URL that passes the "same origin" check, resulting in the user being redirected to another origin. Rails applications configured to store the flash information in a session cookie may be vulnerable, if this can be chained with an attack that allows injection of arbitrary data into the session cookie. This issue has been patched in version 1.3.0. If upgrading is not possible at this time, a way to mitigate the chained attack can be done by explicitly setting SameSite=Lax or SameSite=Strict on the application session cookie.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/basecamp/google_sign_in/commit/85903651201257d4f14b97d4582e6d968ac32f15GitHubgithub.com/basecamp/google_sign_in/pull/73GitHubgithub.com/basecamp/google_sign_in/releases/tag/v1.3.0GitHubgithub.com/basecamp/google_sign_in/security/advisories/GHSA-7pwc-wh6m-44q3

How CyberStrike helps

Frequently asked questions

What is CVE-2025-57821?

CVE-2025-57821 is a medium-severity vulnerability. It was published on August 27, 2025 and has a CVSS 3.1 base score of 4.2 (MEDIUM).

How severe is CVE-2025-57821?

This vulnerability has a CVSS 3.1 base score of 4.2, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-57821?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-57821?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-57821 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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