{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-123017", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "state": "PUBLISHED", "assignerShortName": "mitre", "dateReserved": "2026-11-05T06:17:04.506Z", "datePublished": "2026-11-05T06:17:04.908Z", "dateUpdated": "2026-11-05T06:17:04.908Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "modules": ["SteamMultiplayerPeer"], "product": "GodotSteam", "programFiles": ["src/godotsteam_multiplayer_peer.cpp", "src/steam_packet_peer.cpp"], "programRoutines": [{"name": "SteamMultiplayerPeer::upgrade_peer"}, {"name": "SteamPacketPeer::set_peer_id"}], "repo": "https://codeberg.org/godotsteam/godotsteam", "vendor": "godotsteam", "versions": [{"lessThanOrEqual": "4.23.2", "status": "affected", "version": "4.17.0", "versionType": "semver"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "A Godot game whose multiplayer transport is GodotSteam's SteamMultiplayerPeer (create_host, host_with_lobby, or connect_to_lobby), in a session the attacker can join: a public or joinable lobby, matchmaking, or an open dedicated server. Games using only achievements, input, or leaderboards, and games on the ENet or WebSocket transports, are not exposed.<br>"}], "value": "A Godot game whose multiplayer transport is GodotSteam's SteamMultiplayerPeer (create_host, host_with_lobby, or connect_to_lobby), in a session the attacker can join: a public or joinable lobby, matchmaking, or an open dedicated server. Games using only achievements, input, or leaderboards, and games on the ENet or WebSocket transports, are not exposed."}], "descriptions": [{"lang": "en", "value": "GodotSteam 4.17 through 4.23.2 trusts the peer value of 1 to mean that a player is the server. A grant_gold(1000000) call can be forged."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-290", "description": "CWE-290 Authentication Bypass by Spoofing", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-11-05T06:17:04.908Z"}, "references": [{"url": "https://axeghost.offprint.app/a/3mzhxoqpnh423-any-networked-co-player-can-act-as-the-server-in-a-godotsteam-game"}, {"url": "https://github.com/bitbutter/godot-security-pocs/tree/main/2026-11-godotsteam-peer-id-claim"}, {"url": "https://codeberg.org/godotsteam/godotsteam"}, {"url": "https://www.openwall.com/lists/oss-security/2026/11/04/11"}], "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Game-side only: on the plugin's peer_connected signal for peer ID 1, compare Steam.get_steam_id_for_peer_id(1) with the expected server Steam ID (the lobby owner, or the ID passed to create_client) and close the multiplayer peer on a mismatch. The guard ships in the reproduction kit. No plugin setting rejects a false claim."}], "value": "Game-side only: on the plugin's peer_connected signal for peer ID 1, compare Steam.get_steam_id_for_peer_id(1) with the expected server Steam ID (the lobby owner, or the ID passed to create_client) and close the multiplayer peer on a mismatch. The guard ships in the reproduction kit. No plugin setting rejects a false claim."}], "x_generator": {"engine": "CVE-Request-form 0.0.1"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "modules": ["SteamMultiplayerPeer"], "product": "GodotSteam", "programFiles": ["src/godotsteam_multiplayer_peer.cpp", "src/steam_packet_peer.cpp"], "programRoutines": [{"name": "SteamMultiplayerPeer::upgrade_peer"}, {"name": "SteamPacketPeer::set_peer_id"}], "repo": "https://codeberg.org/godotsteam/godotsteam", "vendor": "godotsteam", "versions": [{"lessThanOrEqual": "4.23.2", "status": "affected", "version": "4.17.0", "versionType": "semver"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "GodotSteam 4.17 through 4.23.2 trusts the peer value of 1 to mean that a player is the server. A grant_gold(1000000) call can be forged."}], "id": "CVE-2026-123017", "lastModified": "2026-11-05T07:17:24.450", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-11-05T07:17:24.450", "references": [{"source": "cve@mitre.org", "url": "https://axeghost.offprint.app/a/3mzhxoqpnh423-any-networked-co-player-can-act-as-the-server-in-a-godotsteam-game"}, {"source": "cve@mitre.org", "url": "https://codeberg.org/godotsteam/godotsteam"}, {"source": "cve@mitre.org", "url": "https://github.com/bitbutter/godot-security-pocs/tree/main/2026-11-godotsteam-peer-id-claim"}, {"source": "cve@mitre.org", "url": "https://www.openwall.com/lists/oss-security/2026/11/04/11"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "cve@mitre.org", "type": "Primary"}]}

{}