CVE-2026-95805
Deferred Deferred - Pending Action

ACL Bypass in MISP via Malformed Permission Key

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: CIRCL

Description
A typo in the MISP ACLComponent access control configuration caused the ACL rule for the previewEventAttributes action to reference the permission string 'theming_enabled*' (with a trailing asterisk) instead of the correct 'theming_enabled'. In the MISP ACL system, the array values define which role or permission grants access to a given controller action. The adjacent entry previewEventObjects correctly uses ['theming_enabled'], confirming the intended restriction. The malformed key 'theming_enabled*' does not match any valid permission identifier, causing the access control check for previewEventAttributes to malfunction. Depending on the ACL evaluation logic, this could result in either unauthorized users gaining access to the previewEventAttributes endpoint (authorization bypass) or legitimate users being denied access (availability impact).  The previewEventAttributes endpoint exposes event attribute data within MISP so an authorization bypass could expose sensitive indicator and attribute data to users who should not have access.

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Meta Information

Published
2026-09-22
Last Modified
2026-09-22
Generated
2026-09-22
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-95805
EUVD
EUVD-2026-84501

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
misp misp *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-285 The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

A typo in MISP's access control configuration caused the ACL rule for the previewEventAttributes action to incorrectly reference 'theming_enabled*' instead of 'theming_enabled'. This malformed key fails to match any valid permission, potentially allowing unauthorized access to sensitive event attribute data or denying legitimate access.

Detection Guidance

Check the MISP ACLComponent configuration file for the previewEventAttributes key. Look for an entry with 'theming_enabled*' instead of 'theming_enabled'. Use commands like grep to search for the malformed key in ACLComponent.php or related configuration files.

Impact Analysis

This vulnerability could allow unauthorized users to view sensitive event attribute data in MISP or prevent legitimate users from accessing it. The impact depends on the ACL evaluation logic and user permissions.

Mitigation Strategies

Edit the ACLComponent configuration file to correct the typo by changing 'theming_enabled*' to 'theming_enabled' in the previewEventAttributes array. Restart the MISP service to apply changes.

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