CVE-2026-71505 in Dolibarr
Summary
by MITRE • 08/24/2026
Dolibarr before 24.0.0 contains a broken object-level authorization vulnerability in the REST API third-party site account write routes that allows authenticated attackers with third-party creation rights to overwrite the WebPortal password of any company by bypassing per-object access checks that are only enforced on read routes. Attackers can replace the victim company's WebPortal password through the write endpoint, authenticate as that company to access its invoice data, and also obtain the victim's previous password verifier from the API response.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified in Dolibarr versions prior to 24.0.0 represents a critical failure in object-level authorization controls within the application’s REST API architecture. Specifically, this flaw resides in the write routes associated with third-party site accounts. In secure software design, access control mechanisms must be consistently enforced across all operations involving sensitive data objects, including both read and write actions. However, in this instance, the security logic was implemented only for read endpoints, leaving the write endpoints vulnerable to unauthorized modification. This architectural inconsistency allows authenticated attackers who possess basic third-party creation rights to bypass per-object access checks that should restrict their ability to modify specific company records. The core technical flaw is a broken object-level authorization where the server fails to verify whether the authenticated user has permission to edit the target resource, relying instead on insufficient validation logic during write operations.
From an operational perspective, this vulnerability enables severe unauthorized data manipulation and potential account takeover scenarios. An attacker can exploit this weakness by sending crafted requests to the affected REST API endpoints to overwrite the WebPortal password of any company stored within the system. By successfully modifying these credentials, the attacker gains the ability to authenticate as the victim company using its own login details. This grants the adversary full access to sensitive internal data associated with that entity, including financial records such as invoice data and other proprietary business information. The impact extends beyond mere confidentiality loss; it compromises the integrity of corporate communications and financial documentation managed through the platform.
Furthermore, the vulnerability exacerbates security risks by exposing additional credential material during the exploitation process. When an attacker successfully overwrites a victim's WebPortal password via the write endpoint, the API response includes the previous password verifier associated with that account. This leakage provides attackers with cryptographic hashes or verification tokens that can be used for offline cracking attempts to recover plaintext passwords. Even if users employ strong, unique passwords, obtaining these verifiers significantly lowers the barrier for credential compromise through brute-force or rainbow table attacks. Consequently, this flaw not only facilitates immediate unauthorized access but also creates a persistent threat vector by exposing sensitive authentication artifacts that may remain valid across multiple services if password reuse is practiced.
To mitigate this vulnerability, organizations running Dolibarr must upgrade to version 24.0.0 or later where the issue has been resolved. Until an update can be applied, administrators should implement strict network-level access controls to restrict API endpoint availability to trusted IP addresses and enforce robust authentication mechanisms such as multi-factor authentication for all administrative accounts. Additionally, reviewing user permissions is critical; third-party creation rights should be granted only to users who absolutely require them, adhering to the principle of least privilege. Security monitoring tools should also be configured to detect anomalous patterns in API write requests that involve frequent modifications to company account details or unexpected access attempts from non-administrative accounts. This incident highlights the importance of comprehensive security testing that validates authorization logic across all CRUD operations rather than focusing solely on data retrieval protections.
This vulnerability aligns with CWE-284, which describes Improper Access Control, specifically highlighting failures in enforcing object-level permissions during state-changing operations. It also maps to MITRE ATT&CK technique T1078, Valid Accounts, as the exploitation relies on using legitimate but insufficiently privileged credentials to perform unauthorized actions that escalate into full account compromise. The exposure of previous password verifiers further relates to CWE-259, Use of Hard-coded Passwords or Credentials in a broader sense of credential handling failures, although technically it is more accurately categorized under improper output encoding or information disclosure during error handling and response generation processes. Addressing these issues requires both immediate patching and long-term architectural reviews to ensure consistent security enforcement across all API endpoints.