CVE-2026-73136Network attack vector

Unauthenticated resource access via transfer replay

Published Aug 19, 2026 · Updated Aug 19, 2026

Authentication bypass in ZenHive mpp 0.6.1 through 0.6.3 allows remote attackers to obtain paid resources via replayed transfer hashes. In MPP.Methods.Tempo, configuring a static memo makes check_matched_memo_binding/3 accept matching transfers without the per-challenge attribution nonce, and the type="hash" verification path does not verify that the presenter controls the wallet that sent the transaction. Only Tempo deployments that set a static memo are affected; default per-challenge attribution blocks reuse, while stateless deployments permit unlimited replay of any public matching transfer.

CVSS severity8.2
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in ZenHive mpp 0.6.1 through 0.6.3 allows remote attackers to obtain paid resources via replayed transfer hashes. In MPP.Methods.Tempo, configuring a static memo makes check_matched_memo_binding/3 accept matching transfers without the per-challenge attribution nonce, and the type="hash" verification path does not verify that the presenter controls the wallet that sent the transaction. Only Tempo deployments that set a static memo are affected; default per-challenge attribution blocks reuse, while stateless deployments permit unlimited replay of any public matching transfer.

The record

CVE
CVE-2026-73136
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
ZenHive
Product
MPP
Classifications
CWE-294, CWE-345, CAPEC-60, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.6.1 <0.6.4
  2. Affected versionversion=542a525563c2fcedd670b593437deca81c6797a4 <2207d7f456ae14c1d3fcacc6f635bf4f8cee1a34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ZenHive · MPPversion=0.6.1 <0.6.4; version=542a525563c2fcedd670b593437deca81c6797a4 <2207d7f456ae14c1d3fcacc6f635bf4f8cee1a34

Published CVSS scores

8.2EEFCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
CWE-345Insufficient Verification of Data Authenticity
CAPEC-60Reusing Session IDs (aka Session Replay)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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