GCVE-110-OSM-2026-4875

Advisory PublishedCVSS 5.4/10

Vulnetix · Advisory published May 28, 2026

Bug bounty dependency confusion attempt. Package exfiltrates basic system information (hostname, IP, DNS) to security research infrastructure. Behaviors: data exfiltration, network activity, install-time execution. Entrypoint: index.js (install-hook: node index.js) Exfil: qleikdexatsxqhqqrwmktjyr10br7bpqn.oast.fun (custom-c2, recovery: plaintext in index.js) Payload: index.js Key findings: - OAST/Interactsh Exfiltration in index.js: ".oast.fun" - Data Encoding for Exfiltration in index.js: "encodeURIComponent(key)}=${encodeURIComponent(val" - Install Hook Executes Local JS File in package.json: ""preinstall": "node index.js"" - Very New NPM Publisher Account - Publisher Has Other Malicious Packages IOCs: - domains: qleikdexatsxqhqqrwmktjyr10br7bpqn.oast.fun - payloadFileHash: 2b0d53f6924878b10d75c10ddab5723e785e8ef62c775ee669f9ed438e71d949

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Weaknesses (CWE)

CWE-506Embedded Malicious Code

Risk Scores

CVSS 3.1

5.4/10

Medium · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected Products

Vendor	Product	Versions	Platforms
unknown	mattermost-plugin-playbooks-loadtest-browser	all (affected)	—

References

Malicious npm package: mattermost-plugin-playbooks-loadtest-browser

advisory

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