CVE-2026-127081

OpsTree BuildPiper before 2.7.0 Authorization Bypass via Pipeline Stage project_env_id

Published Nov 13, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed

Description

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

OpsTree Solutions

BuildPiper

unaffected

Version	Status	Constraints
`0`	affected	< 2.7.0

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.358% probability within 30 days)

Key SSVC decision points have not yet been added.

References

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

History

Nov 13, 2026 9:45 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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.
Title		OpsTree BuildPiper before 2.7.0 Authorization Bypass via Pipeline Stage project_env_id
Weaknesses		CWE-639
References		https://gist.github.com/neelkotnis/0f4aaf3d9ab99950c7f643546fd7d713 https://www.buildpiper.io/ https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-pipeline-stage-project-env-id
Metrics		cvssV3_1 `{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}` cvssV4_0 `{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}`