Search/CVE-2025-66546
● CVE — Low

CVE-2025-66546

VendornextcloudProductcalendarDiscoveredDec 5, 2025UpdatedDec 9, 2025

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.

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CVSS v3.1
3.3 LOW
EPSS
0.14%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Sep 1, 2026
● 0.00pp
0.14% → 0.14% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorLOCAL
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
ConfidentialityLOW
IntegrityNONE
AvailabilityNONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Connections
2 relationships
Timeline
disclosure → media coverage
Dec 5, 2025
Disclosure — published as a CVE record. · last revised by NVD Dec 9, 2025