EUVD-2026-80254
GHSA-4h6w-pvrh-g28p
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable but AC:H because a specific app-side Cache-Control override plus a shared cache must both be present; S:C as a separate cache component is affected; only low confidentiality, no integrity/availability.
Primary rating from Vendor (EEF).
CVSS VectorVendor: EEF
Lifecycle Timeline
1DescriptionCVE.org
Use of Cache Containing Sensitive Information in ZenHive mpp allows a shared HTTP cache to store a paid response and serve it to clients that never paid.
MPP.Plug.verify_credential in lib/mpp/plug.ex sets payment-receipt and cache-control: private on the connection before the wrapped application runs, and registers no register_before_send/2 callback. Plug.Conn.put_resp_header/3 replaces an existing header, so a mounting application that sets its own cache-control on the paid resource (for example public, max-age=3600) silently overrides the private the library relies on, and a CDN or reverse proxy can then store the paid 200 together with its Payment-Receipt and serve both to unpaid clients. The library-level guarantee is therefore defeatable by the application it protects. For the same reason a downstream non-2xx response still carried Payment-Receipt, issuing a receipt for a response that delivered no resource.
This issue affects mpp: from 0.1.0 before 0.16.2.
AnalysisAI
ZenHive mpp (MPP.Plug payment middleware for Elixir/Phoenix) versions 0.1.0 through 0.16.1 can allow a shared HTTP cache - a CDN or reverse proxy - to store a paid 200 response together with its Payment-Receipt header and replay both to clients that never paid, because the library's own Cache-Control: private is silently replaced when the mounting application sets its own cache directive on the same connection. An unauthenticated remote client that reaches such a cache can therefore obtain paid content and a valid receipt for free, and a related weaker case has a downstream non-2xx response still carrying a Payment-Receipt for a resource that was never delivered (CWE-524). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following, none of which are the library's default: (1) a mounting application that sets its own Cache-Control on the MPP-gated paid resource with a shareable directive (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but modest-severity flaw whose real-world risk is tightly bounded by preconditions. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 0.16.2 - upgrade the mpp dependency to 0.16.2 or later, as indicated by the affected range ('from 0.1.0 before 0.16.2') and the advisory at https://github.com/ZenHive/mpp/security/advisories/GHSA-82qh-vrvm-gqvc, whose fixes are captured in upstream commits https://github.com/ZenHive/mpp/commit/2fd91a5ecbd0b0ad2a4ac202b79659e8126dbc0b (patch) and https://github.com/ZenHive/mpp/commit/2d4d1d94aae7790ae0623063961adbeef171fa71. … Detailed patch versions, workarounds, and compensating controls in full report. |
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