CVE-2026-89186
- Source
- https://cve.org/CVERecord?id=CVE-2026-89186
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89186.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-89186
- Aliases
-
- EEF-CVE-2026-89186
- GHSA-82qh-vrvm-gqvc
- Published
- 2026-09-16T08:24:15Z
- Modified
- 2026-09-18T03:48:32Z
- Severity
-
- 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
- Summary
- mpp writes Payment-Receipt and Cache-Control before the wrapped application runs, letting a consumer's own Cache-Control expose paid responses to shared caches
- Details
-
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.
- Database specific
{ "cna_assigner": "EEF", "cwe_ids": [ "CWE-524" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89186.json", "unresolved_ranges": [ { "extracted_events": [ { "introduced": "2d4d1d94aae7790ae0623063961adbeef171fa71" }, { "fixed": "2fd91a5ecbd0b0ad2a4ac202b79659e8126dbc0b" } ], "source": "AFFECTED_FIELD" } ] }- References
-
- https://cna.erlef.org/cves/CVE-2026-89186.html
- https://github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-89186
- https://repo.hex.pm
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89186.json
- https://github.com/ZenHive/mpp/security/advisories/GHSA-82qh-vrvm-gqvc
- https://nvd.nist.gov/vuln/detail/CVE-2026-89186
- https://github.com/ZenHive/mpp/commit/2d4d1d94aae7790ae0623063961adbeef171fa71
- https://github.com/ZenHive/mpp/commit/2fd91a5ecbd0b0ad2a4ac202b79659e8126dbc0b
- https://github.com/ZenHive/mpp