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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rehan-remade/universal-modder/blob/edf45f6a26cb047886d9d7bcba392c328fc3d317/examples/minecraft-gta5-passthrough/mc/src/client/java/dev/rehan/passthrough/client/HostLink.java#L54-L72 cve-icon cve-icon
https://github.com/rehan-remade/universal-modder/commit/e88f6876745427321eb755ebc98276063a962d8a cve-icon cve-icon
https://github.com/rehan-remade/universal-modder/security/advisories/GHSA-wjf6-3h6v-4gq9 cve-icon cve-icon
https://www.vulncheck.com/advisories/universal-modder-before-e88f687-cross-site-websocket-command-execution-via-hostlink cve-icon cve-icon
History

Mon, 09 Nov 2026 23:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Universal-modder before e88f687 Cross-Site WebSocket Command Execution via HostLink
Weaknesses CWE-1385
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H'}

cvssV4_0

{'score': 7.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-09T23:27:32.693Z

Reserved: 2026-11-09T22:02:59.524Z

Link: CVE-2026-125358

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-10T00:17:07.180

Modified: 2026-11-10T00:17:07.180

Link: CVE-2026-125358

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-10T00:30:20Z

Weaknesses