# CVE-2026-87119: ZenHive mpp authentication bypass in subscription activation

Source: https://junglewise.ai/threats/cve-2026-87119-authentication-bypass-by-capture-replay-in-zenhive-mpp-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-22. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-87119 · Severity: info · Published 2026-09-22

ZenHive mpp is a library that handles subscription payments and key authorizations. An attacker with a captured subscription activation credential can replay it multiple times to charge a payer's wallet repeatedly without needing new authorization, potentially draining funds through repeated unauthorized transactions.

Technologies: [ZenHive Mpp](https://junglewise.ai/threats/technologies/mpp). Vendors: [ZenHive](https://junglewise.ai/threats/vendors/zenhive).

## Quick answers

**Is CVE-2026-87119 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-87119 being exploited in the wild.

**How severe is CVE-2026-87119?** Informational severity, published 22 September 2026.

**Which products and versions are affected?** ZenHive Mpp 0.14.0 to before 0.16.2.

**Is there a fix for CVE-2026-87119?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-87119 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-87119?** Check whether you run ZenHive Mpp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A capture-replay vulnerability exists in MPP.Methods.Tempo.KeyAuthorization.verify/3 where signed authorization tokens lack challenge-binding; the same signature verifies against any server challenge with matching subscription terms. MPP.Methods.Tempo.Subscription.activate/4 deduplicates by challenge ID only, so a replayed credential with a fresh challenge bypasses deduplication, allowing repeated subscription transactions and wallet charges bounded only by expiry and chain semantics.

## Affected products

- ZenHive mpp 0.14.0 to before 0.16.2

## Timeline

- 2026-09-22: disclosed

## References

- [https://repo.hex.pm/](https://repo.hex.pm/)
- [https://github.com/](https://github.com/)

## Related threats

- [mpp gas limit validation failure in broadcast_and_verify](https://junglewise.ai/threats/mpp-vulnerable-to-gas-draining-with-low-gas-limit-9a9ae054)
- [ZenHive mpp input validation bypass in fee-payer cosigning](https://junglewise.ai/threats/mpp-vulnerable-to-gas-draining-with-no-limit-9bf9cd33)
- [ZenHive mpp authorization bypass in payment channel validation](https://junglewise.ai/threats/cve-2026-89420-improper-validation-of-specified-quantity-in-input-in-zenhive-mpp)
- [ZenHive mpp HTTP cache header override vulnerability](https://junglewise.ai/threats/cve-2026-89186-zenhive-mpp-http-cache-header-override-vulnerability)
- [ZenHive mpp duplicate-submission bypass in Tempo deduplication](https://junglewise.ai/threats/cve-2026-88255-zenhive-mpp-duplicate-submission-bypass-in-tempo-deduplication)