PT-2025-49266

CVE-2025-66511

Published

2025-12-05

Updated

2026-10-18

Description by

CVSS 3.1

6.5

Medium

MetricsAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Nextcloud Calendar versions prior to 6.0.3

Description The Calendar application for Nextcloud generates participant tokens for meeting proposals using a predictable hash function. This allows an attacker to compute valid tokens, potentially enabling them to request details and submit dates for meeting proposals. The tokens are not randomly generated.

Recommendations Update to version 6.0.3 or later.

Exploitability

Exploit

Fix

Impacts

Vendors

Affected products

Weakness enumeration

CWE-330: Use of Insufficiently Random Values

Related identifiers

CVE-2025-66511

BDU:2026-03383