CVE-2025-66511: calendar from 6.0.0 (inclusive), before 6.0.3 (exclusive); +1 more affected products

Affected technology

calendar · from 6.0.0 (inclusive), before 6.0.3 (exclusive)
nextcloud

security-advisories · >= 6.0.0-rc.1, < 6.0.3
nextcloud

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An attacker can compute valid participant tokens, which allowed them to request details and submit dates in meeting proposals. Vendor/CNA’s CVSS 3.1 assessment (base score 4.8/10) rates confidentiality and integrity impact as low; availability impact as none. NVD’s CVSS 3.1 assessment (base score 6.5/10) rates confidentiality and integrity impact as low; availability impact as none.