{"id":"CVE-2026-5724","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-5724","generatedAt":"2026-10-28T08:10:55.676Z","title":"An attacker with network access to the frontend port could open the replication stream without authentication.","description":"The frontend gRPC server's streaming interceptor chain did not include the authorization interceptor. When a ClaimMapper and Authorizer are configured, unary RPCs enforce authentication and authorization, but the streaming AdminService/StreamWorkflowReplicationMessages endpoint accepted requests without credentials. This endpoint is registered on the same port as WorkflowService and cannot be disabled independently. An attacker with network access to the frontend port could open the replication stream without authentication. Data exfiltration is possible, but  only when a configured replication target is correctly configured and the attacker has knowledge of the cluster configuration, as the history service validates cluster IDs and peer membership before returning replication data.\n\n\n\n\nThe fix was applied per release line: it is present in 1.28.4, 1.29.6, 1.30.4, 1.31.2, and 1.32.0 and later releases on each line. Releases 1.31.0 and 1.31.1 do not contain the fix and are affected.\n\n\n\n\nTemporal Cloud is not affected.","published":"2026-04-10T21:16:28.000Z","lastModified":"2026-07-08T20:17:00.000Z","status":"Awaiting Analysis","sourceIdentifier":"security@temporal.io","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/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/M"},"cwe":["CWE-306"],"affected":[],"epss":{"score":0.00527,"percentile":0.44446,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.53%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/temporalio/temporal/releases/tag/v1.28.4","source":"security@temporal.io"},{"url":"https://github.com/temporalio/temporal/releases/tag/v1.29.6","source":"security@temporal.io"},{"url":"https://github.com/temporalio/temporal/releases/tag/v1.30.4","source":"security@temporal.io"},{"url":"https://github.com/temporalio/temporal/releases/tag/v1.31.2","source":"security@temporal.io"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-5724","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}