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CVE-2026-40139 is a critical pre-authentication vulnerability in the authentication subsystem of BeyondTrust Remote Support. The flaw is caused by improper processing of authentication requests, which can allow an unauthenticated remote attacker to bypass access controls and obtain unauthorized access to the appliance. Available reporting indicates exploitation is dependent on a specific authentication configuration being enabled. In the worst case, successful exploitation can expose accounts with elevated privileges and provide unauthorized access to systems managed through the appliance.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
25 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication request processing flaw in BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) that enables unauthenticated remote attackers to gain unauthorized access.
A critical authentication bypass vulnerability in BeyondTrust Remote Support that can allow unauthenticated remote attackers to bypass access controls and gain unauthorized appliance access under specific authentication configurations.
A critical authentication-related vulnerability in BeyondTrust RS/PRA that can allow unauthenticated access bypass and appliance access, potentially including elevated privileges, when a specific authentication configuration is enabled.
A critical pre-authentication improper authentication vulnerability in BeyondTrust Remote Support caused by improper processing of authentication requests, potentially allowing unauthenticated attackers to bypass access controls and gain unauthorized access under certain configurations.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.