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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 the issue affects BeyondTrust Remote Support 25.3.2 and earlier, and exploitation can result in access to accounts with elevated privileges. The vulnerability is remotely exploitable and does not require user interaction, but exploitation depends on a specific authentication configuration being enabled.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A critical pre-authentication authentication bypass vulnerability in BeyondTrust Remote Support that could allow an unauthenticated remote attacker to gain unauthorized access, including elevated privileges, when a specific authentication configuration is enabled.
An authentication request processing flaw in BeyondTrust RS that enables unauthenticated remote attackers to gain unauthorized access to vulnerable instances under specific configurations.
A critical improper authentication vulnerability in BeyondTrust Remote Support and Privileged Remote Access that can allow a network-positioned, unauthenticated attacker to bypass authentication and gain access to elevated-privilege accounts when a specific authentication configuration is enabled.
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.