CVE-2025-66546
3.3
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nextcloud | security-advisories | >= 6.0.0-rc.1, < 6.0.1 | affected |
| nextcloud | security-advisories | >= 5.0.0-rc.1, < 5.5.6 | affected |
| nextcloud | security-advisories | >= 3.0.0-beta1, < 4.7.19 | affected |
Weaknesses
- CWE-639: CWE-639: Authorization Bypass Through User-Controlled Key
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95
- https://github.com/nextcloud/calendar/pull/7537
- https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3
- https://hackerone.com/reports/3275810
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