CVE-2026-127081

MEDIUM 4.3

OpsTree BuildPiper before 2.7.0 Authorization Bypass via Pipeline Stage project_env_id

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

OpsTree BuildPiper before 2.7.0 contains an authorization bypass vulnerability that allows authenticated users to link pipeline stages to environments of other projects by supplying a foreign project_env_id. Attackers can submit another project's environment identifier to the POST /api/v1/pipeline/{pipeline_id}/stages/ endpoint, persisting cross-project associations that bypass project separation.

CWE	CWE-639
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:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

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/0f4aaf3d9ab99950c7f643546fd7d713 buildpiper.io: https://www.buildpiper.io/ vulncheck.com: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-pipeline-stage-project-env-id

Credits

Neel Saurabh Kotnis