Affects widely-used BeyondTrust auth appliances; pre-auth bypass enables full access with elevated privileges.
CVE-2026-40138
Pre-auth bypass in BeyondTrust appliance auth enables unauthorized privileged access.
Is CVE-2026-40138 being exploited?
Not confirmed. CVE-2026-40138 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-40138?
CVE-2026-40138 is rated Critical with a CVSS score of 9.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-40138?
Yes. A fix has been recorded for CVE-2026-40138. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40138 affect?
CVE-2026-40138 affects BeyondTrust Remote Support Appliance, BeyondTrust Privileged Remote Access Appliance. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40138?
Patch when available; restrict access to management interfaces until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network attacker can bypass authentication and gain elevated privileges on the appliance.
Immediate action required
- affected<= 25.3.2
- affected<= 25.3.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.