CVE-2025-66511 impacts Nextcloud Calendar versions prior to 6.0.3, where a flaw in participant token generation allows attackers to compute valid tokens. This enables unauthorized access to meeting proposal details and the submission of dates. Rated as MEDIUM severity with a CVSS score of 6.5, the vulnerability has a low attack complexity and requires no user interaction, potentially leading to unauthorized information disclosure and modification. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 6.0.0, < 6.0.3CPE matchmatch criteria | cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
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The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.