Security Advisory

CVE-2025-66511

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2025-12-05 16:42:30

Last updated 2025-12-05 16:53:52

Assigner GitHub_M

CVSS score 4.8

State PUBLISHED

Description

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash function, allowing an attacker to compute valid participant tokens, which allowed them to request details and submit dates in meeting proposals. The tokens are not purely random generated. This vulnerability is fixed in 6.0.3.

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