CVE-2026-125358 json
Universal-modder before e88f687 Cross-Site WebSocket Command Execution via HostLink
published 6d ago modified 2d ago also EUVD-2026-120521 , GHSA-wjf6-3h6v-4gq9
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository rehan-remade/universal-modder. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Is CVE-2026-125358 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.2 | 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 |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H |
| CNA | 4.0 | 7.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H |
Affected products
- rehan-remade universal-modder
Classification
- Weakness
-
- CWE-1385 Missing Origin Validation in WebSockets
References
-
github.com
/rehan-remade/universal-modder/commit/e88f6876745427321eb755ebc98276063a962d8a
patch
-
github.com
/rehan-remade/universal-modder/security/advisories/GHSA-wjf6-3h6v-4gq9
vendor-advisory, advisory
-
github.com
/rehan-remade/universal-modder/blob/edf45f6a26cb047886d9d7bcba392c328fc3d317/examples/minecraft-gta5-passthrou
technical-description
-
vulncheck.com
/advisories/universal-modder-before-e88f687-cross-site-websocket-command-execution-via-hostlink
third-party-advisory
Sources
- CVE List CVE-2026-125358
- NVD CVE-2026-125358
- Maintainer advisory GHSA-wjf6-3h6v-4gq9
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of rehan-remade/universal-modder published their own advisory on GitHub. Reviewed sources take precedence over it.