CVE-2026-1436
Received Received - Intake
IDOR Vulnerability in Graylog API 2.2.3 Exposes User Data

Publication date: 2026-02-18

Last updated on: 2026-02-18

Assigner: Spanish National Cybersecurity Institute, S.A. (INCIBE)

Description
Improper Access Control (IDOR) in the Graylog API, version 2.2.3, which occurs when modifying the user ID in the URL. An authenticated user can access other user's profiles without proper authorization checks. Exploiting this vulnerability allows valid users of the system to be listed and sensitive third-party information to be accessed, such as names, email addresses, internal identifiers, and last activity. The endpoint 'http://<IP>:12900/users/<my_user>' does not implement object-level authorization validations.
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Meta Information
Published
2026-02-18
Last Modified
2026-02-18
Generated
2026-06-16
AI Q&A
2026-02-18
EPSS Evaluated
2026-06-15
NVD
CVE-2026-1436
EUVD
EUVD-2026-8076
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
graylog graylog 2.2.3
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
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Executive Summary

This vulnerability is an Improper Access Control issue, specifically an Insecure Direct Object Reference (IDOR), found in the Graylog API version 2.2.3. It occurs when an authenticated user modifies the user ID in the URL to access other users' profiles without proper authorization checks. The API endpoint does not validate object-level permissions, allowing unauthorized access to sensitive user information.

Impact Analysis

Exploiting this vulnerability allows valid users to list other users of the system and access sensitive third-party information such as names, email addresses, internal identifiers, and last activity. This unauthorized access can lead to privacy breaches and potential misuse of personal data.

Compliance Impact

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