CVE
OpsTree BuildPiper authorization bypass in environment creation API
BuildPiper versions before 2.7.0 are affected. Fixed in 2.7.0.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
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
- Exploited
- No known exploitation
- Fix
- Fixed in 2.7.0
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. BuildPiper versions before 2.7.0
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.37% · 31st percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 15/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
OpsTree BuildPiper versions before 2.7.0 contain an authorization bypass that lets a logged-in user create environments on Kubernetes clusters assigned to other projects by tampering with request values. An attacker can reach it remotely over the network with low-privilege login, and then run builds and deployments into another project's cluster, breaking project isolation.
Original description
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.
Who should check
Teams running OpsTree BuildPiper before 2.7.0 that use Kubernetes clusters shared across projects.
“OpsTree BuildPiper before 2.7.0 contains an authorization bypass vulnerability”
cve.now Index
- Exploitation0/40No signal
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.1/10CVSS 7.1
- No patch0/5No signal
What would change the score
- Would score about 65 if added to CISA KEV
- Would score about 60 if CISA's SSVC rates exploitation active
- Would score about 22 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
BuildPiper versions before 2.7.0Upgrade to a fixed version: 2.7.0.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-127077 (OpsTree BuildPiper before 2.7.0 Authorization Bypass via Environment Creation API), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-127077 (entry last updated 2026-11-13):
Affected:
- OpsTree Solutions BuildPiper: fixed in 2.7.0
Fixed versions: 2.7.0.
Conditions (all must be true for the bug to be hit):
- BuildPiper versions before 2.7.0 (source: https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-environment-creation-api)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, no user action.
CISA KEV: CVE-2026-127077 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-127077 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://www.buildpiper.io/
- https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-authorization-bypass-via-environment-creation-api
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-127077
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-127077"}.Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- OpsTree Solutions BuildPiper
fixed in 2.7.0
Evidence 5
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Public exploit code · 1
Establishes: Public exploit code exists (Exploit-DB, Metasploit, Nuclei and GitHub).
- Exploit
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-127077
Is CVE-2026-127077 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
Authenticated users can create environments on unassigned Kubernetes clusters, then trigger builds and deployments into another project's cluster, bypassing project isolation.Source: vulncheck.com
Which versions are affected by CVE-2026-127077?
BuildPiper: before 2.7.0.Source: cve.now feed data
Am I affected, and how do I check?
BuildPiper versions before 2.7.0 are affected. To check a deployment, compare the BuildPiper version it runs against 2.7.0.Source: vulncheck.com
How do I fix CVE-2026-127077?
Upgrade BuildPiper to version 2.7.0 or later.Source: vulncheck.com