Description
Juspay Hyperswitch through 1.128.0 (and builds before 2026.10.19.0) contains a missing authorization vulnerability that allows unauthenticated attackers to confirm payouts with any client_secret via POST /payouts/{payout_id}/confirm. Attackers holding the merchant's publishable key and a payout_id can confirm payouts and overwrite amount, currency, connector, and routing fields to trigger unauthorized merchant payouts.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| juspay | hyperswitch | ≤ 1.128.0, < 2026.10.19.0 | 2026.10.19.0 |
References
- https://github.com/juspay/hyperswitch/commit/f1144ec5c7e38b3b048fe797fad57e743041f345 patch
- https://github.com/juspay/hyperswitch/commit/607b15fcc4b7dae71c2aafb8c004eea333ac6fd8 patch
- https://github.com/juspay/hyperswitch/blob/v1.128.0/crates/router/src/services/authentication.rs#L5921-L5927 technical-description
- https://github.com/juspay/hyperswitch/blob/2026.09.21.0/crates/router/src/core/payouts/helpers.rs#L1465 technical-description
- https://abraxaslabs.tech/research/hyperswitch-payout-confirm-secret third-party-advisory
- https://github.com/juspay/hyperswitch product
- VulnCheck Advisory: Hyperswitch through 1.128.0 Missing Authorization in Payout Confirmation third-party-advisory