CVE-2026-124015 in XWEB EVO
Summary
by MITRE • 11/12/2026
XWEB EVO 5.6.2 through 5.8.8 contains an authentication bypass vulnerability that allows unauthenticated attackers to set the password of any account flagged must-reset-at-next-login by exploiting missing session validation in the users.lua update_password action. Attackers can reset the password of newly onboarded operator accounts, clearing the password_expiration flag and gaining an immediately usable authenticated foothold on the system. This product line reached it's end of service date in March 2026.
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Analysis
by VulDB Data Team • 11/12/2026
The vulnerability identified within XWEB EVO versions 5.6.2 through 5.8.8 represents a critical authentication bypass flaw rooted in improper session validation mechanisms during password update operations. Specifically, the defect resides in the users.lua script's update_password action handler, which fails to adequately verify the authenticity and integrity of the user session before processing credential changes. This architectural oversight allows unauthenticated actors to interact directly with the backend logic responsible for modifying account credentials without first establishing a valid authenticated state. By exploiting this gap, an attacker can manipulate the password fields associated with any target account that carries the must-reset-at-next-login flag, effectively bypassing standard authentication protocols and gaining unauthorized access control over user identities within the system.
From a technical perspective, the core issue is a lack of strict session validation checks prior to executing sensitive administrative or self-service functions. In secure web applications, actions such as changing passwords typically require proof that the requester is the legitimate owner of the account or possesses valid administrator privileges. However, in this implementation, the system accepts password reset requests from unauthenticated sources if they target accounts marked for mandatory password changes upon next login. This design flaw enables an attacker to bypass the initial authentication gate entirely by directly invoking the update_password endpoint with crafted parameters that clear the password expiration flag and set a new password of their choosing. Consequently, the account transitions from a state requiring immediate credential renewal to one with fully active credentials controlled by the adversary.
The operational impact of this vulnerability is severe, as it facilitates an immediately usable authenticated foothold on the target system without prior knowledge of existing valid credentials. Attackers can specifically target newly onboarded operator accounts that are provisioned with temporary passwords and flagged for mandatory reset upon first use. By resetting these passwords remotely, the attacker gains persistent access to operational interfaces, potentially allowing them to execute administrative commands, exfiltrate sensitive data, or pivot further into the network infrastructure. This capability undermines the fundamental security principle of least privilege and compromises the integrity of identity management processes within the XWEB EVO environment.
This vulnerability aligns with CWE-287 Improper Authentication, as it involves a failure to correctly verify user credentials before granting access privileges. Additionally, it relates to CWE-613 Insufficient Session Expiration due to the manipulation of session-related flags that control account validity and password expiration states. In terms of offensive security frameworks, this exploit maps to MITRE ATT&CK technique T1078 Valid Accounts, where adversaries leverage legitimate credentials obtained through unauthorized means to maintain access and perform actions within the system. The ability to reset passwords for accounts in a specific state also touches upon aspects of credential manipulation often seen in lateral movement strategies.
Given that this product line has reached its end-of-service date as of March 2026, immediate remediation via vendor patches is no longer an option. Organizations still running these affected versions must prioritize isolation and access control hardening to mitigate risk. Recommended mitigations include restricting network exposure of the XWEB EVO management interface by placing it behind a secure web gateway or firewall that enforces strict IP whitelisting for administrative access. Implementing multi-factor authentication at the infrastructure level, such as via an external identity provider or reverse proxy, can add a critical layer of verification independent of the application's internal session logic. Furthermore, continuous monitoring should be established to detect anomalous login patterns or password change events originating from untrusted sources until the system is decommissioned and replaced with supported software alternatives.