CVE-2025-66546 describes a low-severity vulnerability in Nextcloud Calendar versions prior to 4.7.19, 5.5.6, and 6.0.1, where an attacker could blindly book appointments by guessing sequential IDs without needing an appointment token. This local attack (AV:L) has low complexity (AC:L) and requires low privileges (PR:L), potentially leading to a low impact on confidentiality (C:L) but no impact on integrity or availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 4.0.0, < 4.7.19CPE matchmatch criteria | cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:* | ||
>= 5.0.0, < 5.5.6CPE matchmatch criteria | cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:* | ||
6.0.0CPE matchmatch criteria | cpe:2.3:a:nextcloud:calendar:6.0.0:-:*:*:*:*:*:* | ||
6.0.0CPE matchmatch criteria | cpe:2.3:a:nextcloud:calendar:6.0.0:rc1:*:*:*:*:*:* | ||
6.0.0CPE matchmatch criteria | cpe:2.3:a:nextcloud:calendar:6.0.0:rc2:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
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