Unrated severityNVD Advisory· Published Dec 5, 2025· Updated Dec 5, 2025
Nextcloud Calendar app allowed booking appointments without the generated token
CVE-2025-66546
Description
Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.19, 5.5.6, and 6.0.1, the calendar app allowed blindly booking appointments with a squential ID without known the appointment token. This vulnerability is fixed in 4.7.19, 5.5.6, and 6.0.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: <4.7.19, <5.5.6, <6.0.1
- nextcloud/security-advisoriesv5Range: >= 6.0.0-rc.1, < 6.0.1
Patches
Vulnerability mechanics
References
4- github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3mitrex_refsource_MISC
- github.com/nextcloud/calendar/pull/7537mitrex_refsource_MISC
- github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95mitrex_refsource_CONFIRM
- hackerone.com/reports/3275810mitrex_refsource_MISC
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