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CVE-2026-52883 is an authorization validation flaw in MantisBT affecting the SOAP mc_issue_update endpoint and a related REST API path. The vulnerability allows a user with UPDATER access to add note types that should be subject to stronger authorization controls, specifically TIME_TRACKING notes and, through SOAP, REMINDER notes. The issue stems from insufficient server-side authorization validation when processing issue update requests, enabling an authenticated user to submit note data that is accepted as privileged note content despite lacking the intended permissions for that note type.
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