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CVE-2026-127079: OpsTree BuildPiper Security Vulnerability

CVE-2026-127079 explained: critical Security Vulnerability in OpsTree BuildPiper. CVSS 9.1. Affected versions, detection, fixes and CTEM priority.

Last updated: Nov 13, 2026

CVSS
9.1 CRITICAL
EPSS
0.43%
CISA KEV
Not listed
CWE
CWE-307

Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS

CVE-2026-127079 Overview

OpsTree BuildPiper before 2.7.0 lacks rate limiting on password-reset OTP verification, allowing unauthenticated attackers to brute force 6-digit OTPs. Attackers can initiate a reset and submit unthrottled guesses to the check_otp endpoint, resetting the target's password and taking over the account.

Critical Impact

Remote, unauthenticated attackers can exploit this Security Vulnerability in OpsTree BuildPiper. The CVSS base score is 9.1 (Critical).

Affected Products

  • OpsTree BuildPiper: see the vendor advisory for the exact affected versions

Discovery Timeline

  • 2026-11-13: CVE-2026-127079 published to the National Vulnerability Database by disclosure@vulncheck.com
  • 2026-11-13: last updated in the NVD database

Technical Details for CVE-2026-127079

Vulnerability Analysis

CVE-2026-127079 is a Security Vulnerability weakness (CWE-307) in OpsTree BuildPiper. Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction.

With a CVSS base score of 9.1 and an EPSS exploitation probability of 0.43 percent, apply the vendor fix and confirm exposure on internet facing and business critical assets first.

Root Cause

The vendor description states: OpsTree BuildPiper before 2.7.0 lacks rate limiting on password-reset OTP verification, allowing unauthenticated attackers to brute force 6-digit OTPs. Attackers can initiate a reset and submit unthrottled guesses to the check_otp endpoint, resetting the target's password and taking over the account.

Attack Vector

Based on the CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Attack complexity is high complexity.

No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/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

Detection Methods for CVE-2026-127079

Detection Strategies

  • Inventory every instance of OpsTree BuildPiper and compare the running version with the affected range above.
  • Check external attack surface scans for internet facing instances of the component.
  • Run an authenticated vulnerability scan once your scanner ships a check for this CVE.

Monitoring Recommendations

  • Forward OpsTree BuildPiper application, access and audit logs to your SIEM for retrospective hunting.
  • Alert on new processes, configuration changes or outbound connections from the affected service.
  • Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.

How to Mitigate CVE-2026-127079

Immediate Actions Required

  • Apply the fixed version of OpsTree BuildPiper named in the vendor advisory.
  • Prioritize internet facing and business critical instances first.
  • Rescan after the change to confirm the exposure is closed.

Patch Information

Use the fixed version listed in the vendor advisory for OpsTree BuildPiper.

Workarounds

  • If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.

CWE References

Technical References

This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.

Frequently asked questions

CVE-2026-127079 is a critical severity Security Vulnerability in OpsTree BuildPiper with a CVSS score of 9.1. Apply the vendor fix and confirm exposure on internet facing and business critical assets first.

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