CVE-2025-57821

MEDIUMNVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.2 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 82% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
4.2
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
4.2
EG Score
4.2(medium)
EPSS
13.1%
KEV
Not listed

Published

August 27, 2025

Last Modified

April 15, 2026

References (4)

Affected Packages

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
google_sign_in0.1 ... 1.2.1 (13 versions)1.3.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 115 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 14:07 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
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  20. 2026-07-10 07:27 UTCOSV refresh
  21. 2026-07-09 19:09 UTCEPSS rescore
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  1. 2026-07-06 02:23 UTCEPSS rescore
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  20. 2026-06-21 17:43 UTCOSV refresh
  21. 2026-06-21 14:56 UTCEPSS rescore
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  23. 2026-06-21 01:59 UTCEPSS rescore
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  25. 2026-06-19 19:25 UTCEPSS rescore
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  27. 2026-06-18 17:52 UTCEPSS rescore
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  32. 2026-06-15 17:48 UTCEPSS rescore
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  40. 2026-06-10 13:22 UTCEPSS rescore
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  42. 2026-06-08 14:16 UTCEPSS rescore
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  44. 2026-06-07 15:24 UTCEPSS rescore
  45. 2026-06-07 15:24 UTCEPSS rescore
  46. 2026-06-06 13:47 UTCEPSS rescore
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  48. 2026-06-05 22:46 UTCEPSS rescore
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  50. 2026-06-05 06:10 UTCEPSS rescore
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  52. 2026-06-04 13:12 UTCEPSS rescore
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  54. 2026-06-02 20:12 UTCEPSS rescore
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  56. 2026-06-02 18:32 UTCOSV refresh
  57. 2026-06-01 13:51 UTCEPSS rescore
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  59. 2026-05-31 22:30 UTCEPSS rescore
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  63. 2026-05-29 13:44 UTCEPSS rescore
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  72. 2026-05-26 07:18 UTCEPSS rescore
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  74. 2026-05-26 07:18 UTCEPSS rescore
  75. 2026-05-24 16:57 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-57821?
CVE-2025-57821 is a medium vulnerability published on August 27, 2025. 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…
When was CVE-2025-57821 disclosed?
CVE-2025-57821 was first published in the National Vulnerability Database on August 27, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-57821 actively exploited?
CVE-2025-57821 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-57821?
CVE-2025-57821 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2025-57821?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-57821, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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