Skip to content
CVE PROGRAM SOURCE RECORD8.2 High

CVE-2026-87119

mpp Tempo subscription key authorization is not bound to the issuing challenge, allowing a captured activation credential to be replayed

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
EEF

Description

Authentication Bypass by Capture-replay in ZenHive mpp allows an attacker holding a captured subscription activation credential to charge the payer repeatedly. The payer signs a Tempo KeyAuthorization over the chain id, key type, key id, expiry, limits and scopes only, with nothing tying it to the challenge that prompted it. MPP.Methods.Tempo.KeyAuthorization.verify/3 in lib/mpp/methods/tempo/key_authorization.ex pins each of those signed fields against the subscription request, and the access key it pins is a static per-endpoint server key, so one signed authorization verifies against every challenge the server issues for the same subscription terms. MPP.Methods.Tempo.Subscription.activate/4 deduplicates activations by challenge id, so presenting the captured credential under a fresh challenge produces a different dedup key, claim_activation succeeds, and the subscription transaction is built and broadcast again. Each replay charges the payer's wallet a new first-period settlement and re-authorizes the server key, bounded only by the subscription expiry and the chain's own semantics for re-installing an existing key. This issue affects mpp: from 0.14.0 before 0.16.2.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

ZenHive mpp

Default version status: unaffected

  • 0.14.0 to < 0.16.2affected
pkg:hex/mpp

ZenHive mpp

Default version status: unaffected

  • db464dfa9a86ccda58f0827101f6da6bd8aafa78 to < 4b6eaec02af0e8485cfb4ff68f467d075ed5dd6faffected
pkg:github/zenhive/mpp

References