# CVE-2026-126812: blueprintUE Self-Hosted Edition before 4.3.7 Empty MariaDB Root Password via Docker Compose

Status: published. Published: 2026-11-11. Updated: 2026-11-13.

blueprintUE Self-Hosted Edition before 4.3.7 contains an insecure default configuration in its Docker Compose examples that sets MYSQL_ALLOW_EMPTY_PASSWORD=yes in database.env and publishes MariaDB on port 3306. Unauthenticated attackers reaching the Docker host on port 3306 can log in as root without a password to read, modify, or delete user accounts, blueprints, and all databases.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/e6a6e1d4c2f22efbbabf9fb31ec479544405b469
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/270

## Affected products and versions

- blueprintue / blueprintue-self-hosted-edition (blueprintue/blueprintue-self-hosted-edition): ≥ 1.0.0; < 4.3.7 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.3 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 9.3 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.60% as of 2026-11-12; percentile 49.38%

- SSVC: exploitation poc; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-258

## Exploit evidence

- exploit: https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-9f6r-vjc7-jq67 (ADP: CISA-ADP)

## References

- https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-9f6r-vjc7-jq67 (CNA: VulnCheck; vendor-advisory)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/e6a6e1d4c2f22efbbabf9fb31ec479544405b469 (CNA: VulnCheck; patch)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/270 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.7 (CNA: VulnCheck; release-notes)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.6/docker-examples/database.env (CNA: VulnCheck; technical-description)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.6/docker-examples/docker-compose-smtp.yml#L14-L24 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-before-4.3.7-empty-mariadb-root-password-via-docker-compose (CNA: VulnCheck; third-party-advisory)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-9f6r-vjc7-jq67 (ADP: CISA-ADP; exploit)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.6/docker-examples/database.env (disclosure@vulncheck.com)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/blob/v4.3.6/docker-examples/docker-compose-smtp.yml#L14-L24 (disclosure@vulncheck.com)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/e6a6e1d4c2f22efbbabf9fb31ec479544405b469 (disclosure@vulncheck.com)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/pull/270 (disclosure@vulncheck.com)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.7 (disclosure@vulncheck.com)

- https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-9f6r-vjc7-jq67 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-before-4.3.7-empty-mariadb-root-password-via-docker-compose (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-126812; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126812; retrieved 2026-11-13; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-126812; retrieved 2026-11-13; source updated Not reported

Revision: 6f49ee498d93c261c6d18d3adafa3de28498b9b1bd94a29bb57cc0e1ae50cbe5

Canonical: https://y2.dev/cve/CVE-2026-126812

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