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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
3.3 LOW
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub_MCNA
3.3 LOW
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA-ADPADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
VendorProductVersion
nextcloudcalendar
4.0.0 ≤
𝑥
< 4.7.19
nextcloudcalendar
5.0.0 ≤
𝑥
< 5.5.6
nextcloudcalendar
6.0.0
nextcloudcalendar
6.0.0:rc1
nextcloudcalendar
6.0.0:rc2
nextcloudcalendar
6.0.0:rc3
nextcloudcalendar
6.0.0:rc4
nextcloudcalendar
6.0.0:rc5
nextcloudcalendar
6.0.0:rc6
𝑥
= Vulnerable software versions