CVE-2026-90895 in MISP
Summary
by MITRE • 09/14/2026
Affected versions of MISP’s interactive CLI shell implement access control independently from the normal web application, causing several authorization inconsistencies.
The patch shows that CLI access could differ from the web application in multiple security-sensitive areas:
- feed listings did not enforce the same lookup_visible restrictions for non-host-organisation users; - feed detail access did not enforce the same host-organisation/site-admin authorization as FeedsController::view(); - Feed.headers, which can contain HTTP authorization credentials, could be exposed instead of being hidden or masked; - server synchronization authkey values were not explicitly hidden from CLI detail output; - sharing-group detail access did not consistently use SharingGroup::checkIfAuthorised(); - the use command could establish context for a record without first proving that the user was authorized to view that record
The commit additionally hardens pagination and terminal rendering, including neutralization of terminal control sequences found in database-backed values. Those are important hardening changes, but the main vulnerability is the CLI authorization/data-disclosure mismatch.
Version affected: ≤2.5.45
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Analysis
by VulDB Data Team • 09/14/2026
Versions of MISP up to 2.5.45 contain a critical access control inconsistency within its interactive command-line interface that allows unauthorized users to bypass standard web application security restrictions, leading to significant data disclosure and privilege escalation risks. The core flaw stems from the CLI shell implementing its own independent authorization logic rather than reusing or mirroring the robust checks enforced by the primary web-based user interface. This architectural divergence creates a situation where actions permitted in the graphical environment are either incorrectly allowed or denied within the terminal, undermining the principle of least privilege and creating exploitable gaps for attackers who can interact with the CLI component.
The most severe impact involves the exposure of sensitive configuration data that is typically masked or restricted to administrators. Specifically, feed headers containing HTTP authorization credentials were not properly sanitized in CLI output, allowing any authenticated user with access to view these secrets instead of having them hidden. Similarly, server synchronization authentication keys, which are critical for maintaining secure communication between MISP instances, were exposed in plain text during detail operations within the shell. This leakage compromises the integrity of threat intelligence sharing infrastructure and could allow malicious actors to impersonate legitimate servers or intercept sensitive data exchanges.
Beyond credential exposure, the vulnerability facilitates unauthorized access to organizational resources through inconsistent enforcement of visibility rules. Feed listings failed to apply lookup_visible restrictions for non-host-organization users, potentially revealing private feeds intended only for specific communities. Furthermore, feed detail pages did not enforce the same host-organization and site-administrator authorizations required by the web controller, allowing lower-privileged users to inspect sensitive metadata. Sharing group details also suffered from inconsistent authorization checks that bypassed standard verification procedures like checkIfAuthorised, exposing collaborative threat data structures to unauthorized parties.
A particularly dangerous aspect of this flaw is found in the use command functionality, which establishes context for a record without first verifying if the user has permission to view it. This logic error allows an attacker to manipulate session contexts or execute operations on objects they should not be able to access, effectively bypassing object-level security controls. While the patch also addresses secondary issues such as terminal control sequence injection through hardening of pagination and rendering, these are mitigations for potential display-based attacks rather than the primary authorization failure that defines this vulnerability class.
From a classification perspective, this issue aligns with CWE-269 Improper Privilege Management due to inconsistent enforcement of access controls across different interfaces, as well as CWE-200 Information Exposure through Sensitive Data in Error Messages or Logs when credentials are displayed. In the context of the MITRE ATT&CK framework, these flaws enable techniques related to Credential Access via Unsecured Credentials and Discovery of Network Configuration, allowing adversaries to map out infrastructure secrets and internal organizational structures that should remain confidential.
To mitigate this vulnerability, organizations running MISP must immediately upgrade to version 2.5.46 or later where the CLI authorization logic has been synchronized with web application standards. Until an upgrade is possible, administrators should restrict access to the interactive shell by limiting it to trusted system accounts and disabling public-facing CLI endpoints if feasible. It is also critical to rotate any credentials that may have been exposed through feed headers or synchronization keys during the period of vulnerability exposure. Regular audits of user permissions against actual data visibility settings are recommended to ensure no residual inconsistencies remain in custom deployments.