Bug 2570593 (CVE-2026-125358)

Summary: CVE-2026-125358 universal-modder: universal-modder: unauthorized command execution via missing WebSocket origin validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in universal-modder. This vulnerability allows unauthorized command execution due to missing origin validation on the local WebSocket interface. A remote attacker can exploit this flaw by enticing a user to visit a malicious website that sends cross-site requests to the local service, running arbitrary commands with administrative privileges.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-10 20:09:11 UTC
Universal-modder before commit e88f6876745427321eb755ebc98276063a962d8a contains a missing WebSocket Origin validation vulnerability in the HostLink class of its passthrough example mods that allows remote attackers to execute Minecraft commands. Any web page open in the player's browser can connect cross-site to the unauthenticated loopback WebSocket and send cmd messages that WorldBridge.command() runs with operator authority.