おそれがある: warning of an unwelcome possibility
Give notice of a risk that is not yet certain. Check verb and noun connections, risks involving a negative clause, and the difference between occurrence and possibility.
Warning before something happens
強風で電車が遅れるおそれがあります。 warns that strong winds may delay trains. It describes the possibility of delay, not a report that all trains are already late.
The basic use concerns an unwelcome result. For a positive possibility such as 合格するかもしれません, use a suitable expression of uncertainty rather than mechanically replacing it with おそれがある.
Verb and noun connections
A verb can connect in the dictionary form, as in 遅れるおそれがある. A noun takes の, as in 洪水のおそれがある, expressing a risk of flooding.
荷物が届かないおそれがあります。 warns that the package may fail to arrive. The negative verb makes nonarrival the risk; it does not mean that no risk exists.
The size of the possibility and the response
おそれがあります alone does not assign a numerical probability. Distinguish the event being warned about from the evidence for that assessment, and do not read あります as completed occurrence.
問題が大きくなりかねません。 also expresses concern that a problem may grow. おそれがある clearly names an event in a risk notice, while かねない can emphasize that a situation may lead to such a result.
Quick check: Does 中止になるおそれがあります。 confirm that an event has already been canceled?
Show the answer and why
No. It warns of possible cancellation. A separate decision or announcement is needed to confirm actual cancellation.