CVE-2020-8166

A CSRF forgery vulnerability exists in rails < 5.2.5, rails < 6.0.4 that makes it possible for an attacker to, given a global CSRF token such as the one present in the authenticity_token meta tag, forge a per-form CSRF token.

Affected

https://github.com/rails/rails

CVSS v3.1 NVD

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS v2.0 NVD

4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

1.67% chance of exploitation in the next 30 days, 76th percentile

Published

2020-07-02

Updated

2026-04-28

Proof-of-concept exploits (1)

• https://hackerone.com/reports/732415

Security advisories

• https://groups.google.com/g/rubyonrails-security/c/NOjKiGeXUgw
• https://www.debian.org/security/2020/dsa-4766
• advisories/GHSA-jp5v-5gx4-jmj9

References

• CVE Record
• NVD entry