VulnerabilityAnalyzed
CVE-2025-66546
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.
LOW 3.3EPSS 0.14%
Does this matter?
Lower severity and a low EPSS score (0.14%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 3.3 LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-639
- Affected
- nextcloud/calendar
- Source
- security-advisories@github.com
References
- https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3Patch
- https://github.com/nextcloud/calendar/pull/7537Issue Tracking
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95Patch, Vendor Advisory
- https://hackerone.com/reports/3275810Issue Tracking, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.