CVEvulnerability

CVE-2025-66511

6.5 MEDIUM Published 2025-12-05 Modified 2026-10-18 Official page ↗
Status
Analyzed
Published
2025-12-05
Last modified
2026-10-18
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-330

Description

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash function, allowing an attacker to compute valid participant tokens, which allowed them to request details and submit dates in meeting proposals. The tokens are not purely random generated. This vulnerability is fixed in 6.0.3.

Affected configurations

• nextcloud calendar (>= 6.0.0 < 6.0.3)

Related

Weakness · CWE (1)

  • CWE-330 Use of Insufficiently Random Values weakness

References