{"id":"CVE-2026-63405","aliases":["GHSA-5p54-whvp-x327"],"url":"https://o3.security/vulnerability/CVE-2026-63405","summary":"AnyCable: Pusher REST API Does Not Verify Request Body MD5 Enabling Signed-Request Replay with Arbitrary Body","details":"AnyCable is a realtime server for reliable two-way communication that supports any backend. Prior to 1.6.15, the Pusher-compatible REST API in pusher/http.go includes the caller-supplied body_md5 value in the HMAC input but does not calculate the digest of the received request body or compare it with the signed value. An attacker who obtains a legitimate signed POST request can retain its query parameters and auth_signature while replacing the body, causing Handler and handleEvents to accept and broadcast attacker-selected event content. The absence of an auth_timestamp freshness check also allows the captured signature to be replayed indefinitely. This can forge server-side events, modify application state, or deliver attacker-controlled messages to WebSocket clients within the signed request's application context. This issue is fixed in version 1.6.15.","published":"2026-09-18T16:47:37.120Z","modified":"2026-09-19T03:47:27.752507962Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"github.com/anycable/anycable","fixedVersion":"1.6.15"}],"fix":{"url":"https://github.com/anycable/anycable/commit/d2cbadec792f038f4695c84a65c0d957b0fde72c","label":"anycable/anycable@d2cbade"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63405.json"},{"type":"FIX","url":"https://github.com/anycable/anycable/commit/d2cbadec792f038f4695c84a65c0d957b0fde72c"},{"type":"WEB","url":"https://github.com/anycable/anycable/releases/tag/v1.6.15"},{"type":"ADVISORY","url":"https://github.com/anycable/anycable/security/advisories/GHSA-5p54-whvp-x327"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63405"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-19T03:47:27.752507962Z"}}