{"schemaVersion":3,"id":"CVE-2026-73249","aliases":["UBUNTU-CVE-2026-73249","DEBIAN-CVE-2026-73249"],"status":"published","duplicateOf":null,"title":null,"description":"calibre is an e-book manager. Prior to 9.12.0, the calibre Content Server endpoint POST /book-update-annotations/{library_id}/{book_id}/{fmt} in src/calibre/srv/books.py omits needs_db_write=True, causing Router.dispatch() to skip ctx.check_for_write_access() before update_annotations() passes attacker-controlled JSON to db.merge_annotations_for_book(), which allows a readonly user or an anonymous user on an unauthenticated deployment to persist unauthorized book annotation changes. 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