CVE-2026-70658
highPay is a payments engine for Ruby on Rails 6.0 and higher.
Pay is a payments engine for Ruby on Rails 6.0 and higher. Prior to 11.6.2, Pay::Webhooks::PaddleBillingController#valid_signature? in app/controllers/pay/webhooks/paddle_billing_controller.rb compares the computed 64-character SHA-256 HMAC with the attacker-controlled h1 token from the Paddle-Signature header using Ruby String#==. An unauthenticated remote attacker who can repeatedly submit requests to /pay/webhooks/paddle_billing and obtain sufficiently precise timing measurements can infer matching digest prefixes and recover a valid signature. A forged accepted webhook is enqueued through Pay::Webhooks::ProcessJob and can cause a host application to update billing state, provision paid features, record refunds, or trigger customer notifications. This issue is fixed in version 11.6.2.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/pay-rails/pay/commit/ba6494109d88209fba2a4df2d9d6373fe81ed805 security-advisories@github.com
- https://github.com/pay-rails/pay/releases/tag/v11.6.2 security-advisories@github.com
- https://github.com/pay-rails/pay/security/advisories/GHSA-mjgf-xj26-9qf9 security-advisories@github.com
- https://github.com/pay-rails/pay/security/advisories/GHSA-mjgf-xj26-9qf9 134c704f-9b21-4f2e-91b3-4a467353bcc0