Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
The Nextcloud project reports:
NC-SA-2020-026 (low): Password of share by mail is not hashed when
given on the create share call
A logic error in Nextcloud Server 19.0.0 caused a plaintext storage
of the share password when it was given on the initial create API
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