CVE-2026-123017
CVE-2026-123017
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.
Fixes and workarounds
Workaround
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.
Source: CNA: mitreAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| GodotSteam godotsteam |
≥ 4.17.0; ≤ 4.23.2 (affected, semver)
Other versions: unknown |
CNA: mitre |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N | CNA: mitre |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://axeghost.offprint.app/a/3mzhxoqpnh423-any-networked-co-player-can-act-as-the-server-in-a-godotsteam-gameCNA: mitre
- https://github.com/bitbutter/godot-security-pocs/tree/main/2026-11-godotsteam-peer-id-claimCNA: mitre
- https://codeberg.org/godotsteam/godotsteamCNA: mitre
- https://www.openwall.com/lists/oss-security/2026/11/04/11CNA: mitre
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