---
title: "CVE-2026-70658: Pay - Authentication Bypass"
description: "Pay for Ruby on Rails < 11.6.2 contains a timing attack vulnerability caused by insecure comparison of HMAC signatures in PaddleBillingController, letting unauthenticated remote attackers forge accepted webhooks, exploit requires precise timing measurements."
url: https://panop.io/threat-heartbeat/CVE-2026-70658/
---

# CVE-2026-70658 Pay - Authentication Bypass

Pay for Ruby on Rails < 11.6.2 contains a timing attack vulnerability caused by insecure comparison of HMAC signatures in PaddleBillingController, letting unauthenticated remote attackers forge accepted webhooks, exploit requires precise timing measurements.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.58% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-70658)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-208](https://cwe.mitre.org/data/definitions/208.html)

## Vendor fix

Update to version 11.6.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-70658](https://nvd.nist.gov/vuln/detail/CVE-2026-70658)
- [https://github.com/pay-rails/pay/commit/ba6494109d88209fba2a4df2d9d6373fe81ed805](https://github.com/pay-rails/pay/commit/ba6494109d88209fba2a4df2d9d6373fe81ed805)
- [https://github.com/pay-rails/pay/releases/tag/v11.6.2](https://github.com/pay-rails/pay/releases/tag/v11.6.2)
- [https://github.com/pay-rails/pay/security/advisories/GHSA-mjgf-xj26-9qf9](https://github.com/pay-rails/pay/security/advisories/GHSA-mjgf-xj26-9qf9)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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