MISP cti-transmute up to 1.4.0 Reaction comments_repo.toggle_reaction comment_id improper authorization

Summaryinfo

A vulnerability marked as critical has been reported in MISP cti-transmute up to 1.4.0. The impacted element is the function comments_repo.toggle_reaction of the component Reaction Handler. This manipulation of the argument comment_id causes improper authorization. This vulnerability is handled as CVE-2026-73155. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in MISP cti-transmute up to 1.4.0 and classified as critical. Affected by this vulnerability is the function comments_repo.toggle_reaction of the component Reaction Handler. The manipulation of the argument comment_id with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Affected versions of cti-transmute allow authenticated users to add or remove emoji reactions on comments without first checking whether those users are authorized to view the target comment. The vulnerable react() handler passed an attacker-controlled comment_id directly to comments_repo.toggle_reaction() after only validating that the ID existed syntactically and that the requested emoji was permitted. Because comment-level visibility was not enforced, a user who could identify the ID of a private or otherwise inaccessible comment could modify reaction state on that comment despite lacking permission to access it. The fix retrieves the target comment, rejects missing or deleted comments, retrieves its associated conversion, and enforces access.can_see_comment(current_user, comment, conversion). Unauthorized requests now receive HTTP 403.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-73155 since 08/11/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Applying the patch a18c07c3dd4a74b91ad8dd23d6e84fee4bcbd457 is able to eliminate this problem.

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Productinfo

Vendor

• MISP

Name

• cti-transmute

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4.0

License

• open-source

Website

• Product: https://github.com/MISP/cti-transmute/

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