CVE-2026-105832 in EspoCRM
Summary
by MITRE • 10/08/2026
EspoCRM before 10.0.6 contains an authentication bypass vulnerability that accepts a login stopped at the second factor on routes not requiring authentication. Attackers knowing a 2FA-enabled user's username and password can skip the second factor to read config parameters not exposed publicly.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/08/2026
The identified security flaw in EspoCRM versions prior to 10.0.6 represents a critical authentication bypass vulnerability that undermines the integrity of multi-factor authentication controls. The core technical issue stems from an improper enforcement of access control policies within specific application routes. While the system correctly prompts for and validates two-factor authentication credentials on protected endpoints, it fails to perform this validation check when handling requests directed at routes explicitly designated as not requiring initial authentication or public access. This architectural inconsistency creates a logical gap where the security state established by the first factor of authentication is effectively ignored if the subsequent request targets an unauthenticated route, allowing the session to proceed without completing the full verification process.
From a technical perspective, this vulnerability exploits the application's routing logic and session management mechanisms. When a user initiates login with valid username and password credentials, the system acknowledges the first factor but may not immediately enforce the second factor for all subsequent actions if those actions map to public-facing API endpoints or static resource routes that bypass standard middleware checks. An attacker who has obtained legitimate credentials through phishing, credential stuffing, or data breaches can leverage this flaw by directing their authenticated session toward these specific unauthenticated paths. By doing so, they effectively sidestep the second factor requirement, which is designed to provide an additional layer of security against compromised passwords alone. This behavior indicates a failure in the principle of least privilege and consistent state validation across different application modules.
The operational impact of this vulnerability is significant, particularly regarding data confidentiality and system configuration integrity. Although the attacker cannot necessarily gain full administrative control over the entire platform immediately, they can access sensitive configuration parameters that are not exposed to public users or unauthenticated visitors. These config parameters may contain database connection strings, API keys, internal service endpoints, or other critical infrastructure details essential for maintaining the application's security posture and operational stability. Exposure of such information facilitates further reconnaissance by attackers, potentially leading to more severe exploits such as remote code execution, data exfiltration, or lateral movement within the network environment hosting the CRM instance. The ability to read these parameters effectively neutralizes the protective benefit of two-factor authentication for any user whose credentials are compromised and who interacts with these specific routes during their session window.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) categories such as CWE-287, which describes Improper Authentication, specifically regarding the failure to enforce multi-factor requirements consistently across all access paths. It also relates to CWE-613, Insufficient Session Expiration, if the session remains active and usable for these bypassed routes indefinitely after the initial login attempt. In terms of the MITRE ATT&CK framework, this behavior corresponds to techniques under Tactic TA0001 Initial Access, specifically resembling methods used in credential-based attacks where attackers seek to minimize detection by avoiding standard authentication logs associated with full logins or by exploiting trust relationships within the application architecture.
To mitigate this risk, organizations running EspoCRM versions prior to 10.0.6 must upgrade immediately to version 10.0.6 or later, which addresses the routing logic flaw and ensures that multi-factor authentication is enforced uniformly regardless of the target route's public status. In environments where immediate patching is not feasible due to operational constraints, temporary mitigations should include restricting access to sensitive configuration endpoints via network-level controls such as firewalls or Web Application Firewalls (WAFs). Additionally, implementing strict session management policies that invalidate sessions upon any deviation from expected authentication flows can reduce the window of opportunity for exploitation. Security teams should also monitor logs for unusual patterns involving users who have completed only partial authentication steps but are accessing configuration-related resources, which may indicate active attempts to exploit this vulnerability. Regular audits of access control lists and route definitions against security requirements will help prevent similar logical flaws in future development cycles.