CVE-2026-127077

HIGH 7.1

OpsTree BuildPiper before 2.7.0 Authorization Bypass via Environment Creation API

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	opstree solutions
Product	buildpiper
Published	Nov 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Affected Versions

OpsTree Solutions / BuildPiper

0 < 2.7.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gist.github.com: https://gist.github.com/neelkotnis/e6ba937a2ea3f06fc0a79bd6193e4574 buildpiper.io: https://www.buildpiper.io/ vulncheck.com: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-environment-creation-api

Credits

Neel Saurabh Kotnis