CVE-2026-40140 privileged remote access vulnerability
BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerability in the network communication subsystem. Insufficient validation of client-supplied input may allow an unauthenticated remote attacker to trigger a denial-of-service condition affecting appliance availability.
Quick answer
beyondtrust privileged remote access should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
BeyondTrust Remote Support / Privileged Remote Access is affected by CVE-2026-40140, a denial-of-service risk. BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerability in the network communication subsystem. The recommended remediation is to update to BeyondTrust Remote Support / Privileged Remote Access fixed release newer than 25.3.2 as listed in BT26-03. Until the update is complete, limit unauthenticated network access to the appliance and monitor communication subsystem availability until patched, review logs, and reduce exposure of the affected service, library, appliance, or trusted firmware path.
- Inventory every deployment, package, appliance, service, application dependency, trusted firmware image, and managed environment that uses BeyondTrust Remote Support / Privileged Remote Access.
- Confirm the installed version/build and compare it with the affected versions listed in the source advisory and the source advisory for CVE-2026-40140.
- Apply the vendor-supported fix: update to BeyondTrust Remote Support / Privileged Remote Access fixed release newer than 25.3.2 as listed in BT26-03.
- If the update cannot be applied immediately, limit unauthenticated network access to the appliance and monitor communication subsystem availability until patched; disable unnecessary public access, file processing, authentication integrations, upload endpoints, or high-risk features until patched.
- Review application, appliance, reverse-proxy, WAF, package manager, authentication, trusted firmware, and audit logs for activity related to CVE-2026-40140.
- Rotate sessions, API tokens, service credentials, integration keys, signing keys, and administrator passwords if logs or affected data indicate compromise, code execution, credential exposure, or unauthorized access.
- Clear caches, restart affected services, rebuild affected containers or firmware images when appropriate, and remove temporary files, uploaded artifacts, stored payloads, or unsafe configuration created during exploitation attempts.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm BeyondTrust Remote Support / Privileged Remote Access now reports BeyondTrust Remote Support / Privileged Remote Access fixed release newer than 25.3.2 as listed in BT26-03 or a later vendor-supported fixed release/build for the deployed branch.
- Verify the affected workflow no longer allows the behavior described in CVE-2026-40140, using a safe regression test, vendor validation method, dependency inventory, or appliance health check.
- Review logs after remediation for continued exploit attempts, authentication anomalies, denial-of-service symptoms, suspicious uploads, file access, deserialization attempts, or configuration changes.
- Rerun a Fixnx scan and any product-specific scanner, package audit, firmware inventory, appliance health check, or manual regression test relevant to the affected service.
- Document affected assets, fixed versions, mitigation decisions, validation evidence, and any cleanup, rebuild, or credential rotation performed.
Trusted references
FAQ
What is affected by CVE-2026-40140?
beyondtrust privileged remote access should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.