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Vulnerabilities

Security fix · CVE-2025-57821

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

Published Aug 27, 2025 · catalog updated Aug 27, 2025 · Basecamp's Google Sign-In adds

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-57821. EPSS is 0.24%. Act only if a listed version of Basecamp's Google Sign-In adds is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Basecamp's Google Sign-In adds).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium4.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.24%
Remediation
Version ranges on file
Affected products
vendor basecamp google_sign_in < 1.3.0

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=

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor basecamp google_sign_in < 1.3.0< 1.3.0

How to fix CVE-2025-57821

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-57821. EPSS is 0.24%. Act only if a listed version of Basecamp's Google Sign-In adds is installed.

Which versions are affected?

Compare what you have installed with basecamp google_sign_in < 1.3.0 < 1.3.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 27, 2025 · EUVD

    Detected

    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

  2. Aug 27, 2025 · EUVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2025-57821

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-57821

    30-day exploitation probability 0.24%

    first.org
  • EUVDVulnerability recordEUVD-2025-25913

    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 inf

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026