Vulnerability Details CVE-2025-66546
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.0%
CVSS Severity
CVSS v3 Score 3.3
References
Products affected by CVE-2025-66546
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cpe:2.3:a:nextcloud:calendar:4.0.0
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cpe:2.3:a:nextcloud:calendar:4.0.1
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cpe:2.3:a:nextcloud:calendar:4.0.2
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cpe:2.3:a:nextcloud:calendar:4.1.0
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cpe:2.3:a:nextcloud:calendar:4.1.1
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cpe:2.3:a:nextcloud:calendar:4.1.2
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cpe:2.3:a:nextcloud:calendar:4.2.0
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cpe:2.3:a:nextcloud:calendar:4.2.1
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cpe:2.3:a:nextcloud:calendar:4.2.2
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cpe:2.3:a:nextcloud:calendar:4.2.3
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cpe:2.3:a:nextcloud:calendar:4.2.4
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cpe:2.3:a:nextcloud:calendar:4.3.0
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cpe:2.3:a:nextcloud:calendar:4.3.1
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cpe:2.3:a:nextcloud:calendar:4.3.2
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cpe:2.3:a:nextcloud:calendar:4.3.3
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cpe:2.3:a:nextcloud:calendar:4.3.4
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cpe:2.3:a:nextcloud:calendar:4.3.5
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cpe:2.3:a:nextcloud:calendar:4.4.0
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cpe:2.3:a:nextcloud:calendar:4.4.1
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cpe:2.3:a:nextcloud:calendar:4.4.2
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cpe:2.3:a:nextcloud:calendar:4.4.3
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cpe:2.3:a:nextcloud:calendar:4.4.4
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cpe:2.3:a:nextcloud:calendar:4.4.5
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cpe:2.3:a:nextcloud:calendar:4.5.0
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cpe:2.3:a:nextcloud:calendar:4.5.1
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cpe:2.3:a:nextcloud:calendar:4.5.2
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cpe:2.3:a:nextcloud:calendar:4.5.3
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cpe:2.3:a:nextcloud:calendar:4.6.0
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cpe:2.3:a:nextcloud:calendar:4.6.1
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cpe:2.3:a:nextcloud:calendar:4.6.2
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cpe:2.3:a:nextcloud:calendar:4.6.3
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cpe:2.3:a:nextcloud:calendar:4.6.4
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cpe:2.3:a:nextcloud:calendar:4.6.5
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cpe:2.3:a:nextcloud:calendar:4.6.6
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cpe:2.3:a:nextcloud:calendar:4.6.7
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cpe:2.3:a:nextcloud:calendar:4.6.8
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cpe:2.3:a:nextcloud:calendar:4.7.0
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cpe:2.3:a:nextcloud:calendar:4.7.1
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cpe:2.3:a:nextcloud:calendar:4.7.10
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cpe:2.3:a:nextcloud:calendar:4.7.11
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cpe:2.3:a:nextcloud:calendar:4.7.12
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cpe:2.3:a:nextcloud:calendar:4.7.13
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cpe:2.3:a:nextcloud:calendar:4.7.14
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cpe:2.3:a:nextcloud:calendar:4.7.15
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cpe:2.3:a:nextcloud:calendar:4.7.16
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cpe:2.3:a:nextcloud:calendar:4.7.17
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cpe:2.3:a:nextcloud:calendar:4.7.18
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cpe:2.3:a:nextcloud:calendar:4.7.2
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cpe:2.3:a:nextcloud:calendar:4.7.3
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cpe:2.3:a:nextcloud:calendar:4.7.4
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cpe:2.3:a:nextcloud:calendar:4.7.5
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cpe:2.3:a:nextcloud:calendar:4.7.6
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cpe:2.3:a:nextcloud:calendar:4.7.7
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cpe:2.3:a:nextcloud:calendar:4.7.8
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cpe:2.3:a:nextcloud:calendar:4.7.9
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cpe:2.3:a:nextcloud:calendar:5.0.0
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cpe:2.3:a:nextcloud:calendar:5.0.1
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cpe:2.3:a:nextcloud:calendar:5.0.10
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cpe:2.3:a:nextcloud:calendar:5.0.2
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cpe:2.3:a:nextcloud:calendar:5.0.3
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cpe:2.3:a:nextcloud:calendar:5.0.4
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cpe:2.3:a:nextcloud:calendar:5.0.5
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cpe:2.3:a:nextcloud:calendar:5.0.6
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cpe:2.3:a:nextcloud:calendar:5.0.7
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cpe:2.3:a:nextcloud:calendar:5.0.8
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cpe:2.3:a:nextcloud:calendar:5.0.9
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cpe:2.3:a:nextcloud:calendar:5.1.0
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cpe:2.3:a:nextcloud:calendar:5.1.1
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cpe:2.3:a:nextcloud:calendar:5.1.2
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cpe:2.3:a:nextcloud:calendar:5.1.3
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cpe:2.3:a:nextcloud:calendar:5.2.0
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cpe:2.3:a:nextcloud:calendar:5.2.1
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cpe:2.3:a:nextcloud:calendar:5.2.2
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cpe:2.3:a:nextcloud:calendar:5.2.3
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cpe:2.3:a:nextcloud:calendar:5.2.4
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cpe:2.3:a:nextcloud:calendar:5.3.0
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cpe:2.3:a:nextcloud:calendar:5.3.1
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cpe:2.3:a:nextcloud:calendar:5.3.10
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cpe:2.3:a:nextcloud:calendar:5.3.2
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cpe:2.3:a:nextcloud:calendar:5.3.3
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cpe:2.3:a:nextcloud:calendar:5.3.4
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cpe:2.3:a:nextcloud:calendar:5.3.5
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cpe:2.3:a:nextcloud:calendar:5.3.6
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cpe:2.3:a:nextcloud:calendar:5.3.7
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cpe:2.3:a:nextcloud:calendar:5.3.8
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cpe:2.3:a:nextcloud:calendar:5.3.9
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cpe:2.3:a:nextcloud:calendar:5.4.0
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cpe:2.3:a:nextcloud:calendar:5.5.0
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cpe:2.3:a:nextcloud:calendar:5.5.1
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cpe:2.3:a:nextcloud:calendar:5.5.2
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cpe:2.3:a:nextcloud:calendar:5.5.3
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cpe:2.3:a:nextcloud:calendar:5.5.4
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cpe:2.3:a:nextcloud:calendar:5.5.5
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cpe:2.3:a:nextcloud:calendar:6.0.0