# CVE-2026-127077: OpsTree BuildPiper before 2.7.0 Authorization Bypass via Environment Creation API

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

OpsTree BuildPiper before 2.7.0 contains an authorization bypass vulnerability that allows authenticated users to create environments on unassigned Kubernetes clusters by tampering with cluster_id and namespaces values. Attackers can modify requests to POST /api/v1/project/{project_id}/env/ to target another project's cluster, then trigger builds and deployments into it, bypassing project isolation.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- OpsTree Solutions / BuildPiper: ≥ 0; < 2.7.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.1 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N; source: CNA: VulnCheck

- CVSS 4.0: 7.1 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/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: 7.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.37% as of 2026-11-13; percentile 31.23%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-862

## Exploit evidence

- exploit: https://gist.github.com/neelkotnis/e6ba937a2ea3f06fc0a79bd6193e4574 (CNA: VulnCheck)

## References

- https://gist.github.com/neelkotnis/e6ba937a2ea3f06fc0a79bd6193e4574 (CNA: VulnCheck; technical-description, exploit)

- https://www.buildpiper.io/ (CNA: VulnCheck; product)

- https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-environment-creation-api (CNA: VulnCheck; third-party-advisory)

- https://gist.github.com/neelkotnis/e6ba937a2ea3f06fc0a79bd6193e4574 (disclosure@vulncheck.com)

- https://www.buildpiper.io/ (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-environment-creation-api (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-127077; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-127077; retrieved 2026-11-13; source updated 2026-11-13

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-127077; retrieved 2026-11-13; source updated Not reported

Revision: 6b5bdc8a4daba4a4cec1db2fc804740578c4cd86e7d0a4839476b2667509d019

Canonical: https://y2.dev/cve/CVE-2026-127077

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.