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CVE-2025-57821— Basecamp's Google Sign-In for Rails allowed redirects to a malformed URL

Quick assessment

Affected
basecamp google_sign_in
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Basecamp是Basecamp公司的一个项目管理软件。 Basecamp 1.3.0之前版本存在输入验证错误漏洞，该漏洞源于URL验证不当，可能导致重定向攻击。

CVSS 4.2 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-57821

Vulnerability Information
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Vulnerability Title
Basecamp's Google Sign-In for Rails allowed redirects to a malformed URL
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Basecamp 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Basecamp是Basecamp公司的一个项目管理软件。 Basecamp 1.3.0之前版本存在输入验证错误漏洞，该漏洞源于URL验证不当，可能导致重定向攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
basecamp google_sign_in < 1.3.0 -

II. Public POCs for CVE-2025-57821

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III. Intelligence Information for CVE-2025-57821

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IV. Related Vulnerabilities

Same product: google_sign_in
Same vendor: basecamp
Same weakness: CWE-601

V. Comments for CVE-2025-57821

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