Vulnerability · Published Jun 17, 2026 · Assigned by GitHub_M

CVE-2026-54445Vantage6: Set admin user and password from environment or configuration

Medium 6.9

In plain English

A medium-severity security flaw in vantage6 from vantage6. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.3%top 78.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

vantage6 is an open-source infrastructure for privacy preserving analysis. Versions prior to 5.0.0 provide an initial user with username `root` and password `root`. This is not ideal because attackers know that almost all vantage6 servers have a user with username `root` that probably has admin rights, and the initial password is very weak and it is possible that administrators forget to reset it. Version 5.0.0 fixes the issue. As a workaround, it is possible to delete the `root` user after it has been used to create other users.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	vantage6	5.0.0	GHSA-fgmc-2hqj-86v4
PyPI	vantage6	5.0.0	PYSEC-2026-3400

Affected products (as reported)

Vendor	Product	Versions
vantage6	vantage6	< 5.0.0

Weakness: CWE-204, CWE-1393 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References

https://github.com/vantage6/vantage6/security/advisories/GHSA-fgmc-2hqj-86v4 x_refsource_CONFIRM
https://github.com/vantage6/vantage6/issues/1932 x_refsource_MISC
https://github.com/vantage6/vantage6/blob/main/docs/release_notes.rst#500 x_refsource_MISC