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CVE-2026-103239 is a privilege-escalation vulnerability in MISP tag collection creation and editing functionality affecting versions earlier than 2.5.48. The affected actions pass the complete HTTP request payload to a bulk-association save operation. That operation saves both the intended tag collection and associated model data supplied in the request. An authenticated user with the tag editor permission can inject User or Organisation data into a tag collection request, causing unauthorized records to be written and enabling escalation to site administrator.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.