CVE-2026-67581
Authentication Bypass by Capture-replay in ZenHive mpp allows an unauthenticated remote client to obtain paid resources by resubmitting one settled on-chain transfer. MPP.Methods.EVM.verify/2 accepts a transaction-hash credential and matches a transfer purely on token, to and amount (ERC-20) or to and value (native). It binds the proof neither to the challenge being verified nor to any record of prior use, and the generic MPP.Plug dedup store keys on challenge.id, which is regenerated for every 402 response. On a static-price route, a single historical transfer matching the charge therefore satisfies an unbounded number of later charges, including transfers an attacker can read off a public block explorer. This issue affects mpp: from 0.3.0 before 0.6.3.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.7
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- EPSS probability
- 0.50%
- CWE
- CWE-294
- Published
- 2026-08-19
- Last modified
- 2026-08-19
Affected products
- ZenHive mpp
- ZenHive mpp
Weakness type
Related vulnerabilities
- CVE-2026-88278 — GV-LPCLPC2011/2211 - ONVIF WS-Security PasswordDigest Replay
- CVE-2026-55250 — Maravel-Framework Token Replay Vulnerability via Premature JWT Blacklist Eviction in Tagged Caches
- CVE-2026-84003 — Microsoft Authentication Library (MSAL) for Node.js Spoofing Vulnerability
- CVE-2026-69676 — Windows Kerberos Remote Code Execution Vulnerability
- CVE-2026-73312 — XenForo < 2.3.13 Refresh Token Replay via Expired Access Token
- CVE-2026-73311 — XenForo < 2.3.13 OAuth2 Authorization Code Reuse
- CVE-2022-51016 — PocketMine-MP 3.x before 3.27.0 Authentication Bypass via Login Replay
- CVE-2026-86219 — Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step