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CVE-2026-89420— Session voucher adding no new funds is accepted without a charge in mpp, serving paid resources for free

一分钟漏洞结论

影响对象
ZenHive mpp
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged. MPP.Session.Actions.accept_voucher/3 in lib/mpp/session/actions.ex treats a voucher whose cumulati

CVSS 7.1 · High

影响版本矩阵 2

厂商产品 版本范围状态
ZenHive mpp 0.14.0< 0.16.2 affected
82df569c898be1137189e3648e1edb4af6363651< 7270edc1dcfb58250cc5ee812876609206564165 affected
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一、 漏洞 CVE-2026-89420 基础信息

漏洞信息

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Vulnerability Title
Session voucher adding no new funds is accepted without a charge in mpp, serving paid resources for free
来源: CVE Program / CVE List V5
Vulnerability Description
Improper Validation of Specified Quantity in Input in ZenHive mpp allows a client holding an open payment channel to obtain paid resources without being charged. MPP.Session.Actions.accept_voucher/3 in lib/mpp/session/actions.ex treats a voucher whose cumulativeAmount equals the channel's already-accepted cumulative amount as an idempotent success, returning the channel unchanged without calling maybe_spend/2. The credential verifies, the protected resource is served, and spent and units stay where they were. Because the server issues a fresh challenge per request and the credential replay store keys on challenge id and payload, the same signed voucher can be re-presented under every new challenge, so one paid voucher yields an unbounded number of paid units. The path is reachable from any method built on MPP.Session.Method through the Plug, MCP, JSON-RPC and WebSocket transports. This issue affects mpp: from 0.14.0 before 0.16.2.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
ZenHive mpp 0.14.0 ~ 0.16.2 cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*
ZenHive mpp 82df569c898be1137189e3648e1edb4af6363651 ~ 7270edc1dcfb58250cc5ee812876609206564165 cpe:2.3:a:ZenHive:mpp:*:*:*:*:*:*:*:*

二、漏洞 CVE-2026-89420 的公开POC

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三、漏洞 CVE-2026-89420 的情报信息

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CVE-2026-89420 补丁与修复 (1)

CVE-2026-89420 其他参考 (3)

CVE-2026-89420 其他参考 (1)

IV. Related Vulnerabilities

Same product: mpp
Same vendor: ZenHive
Same weakness: CWE-1284

V. Comments for CVE-2026-89420

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