CVE-2022-24838

Nextcloud Calendar is a calendar application for the nextcloud framework. SMTP Command Injection in Appointment Emails via Newlines: as newlines and special characters are not sanitized in the email value in the JSON request, a malicious attacker can inject newlines to break out of the `RCPT TO:<BOOKING USER'S EMAIL> ` SMTP command and begin injecting arbitrary SMTP commands. It is recommended that Calendar is upgraded to 3.2.2. There are no workaround available.

Score

CVSS 3.1 9.8 Critical

Status

Modified - security-advisories@github.com

Published

2022-04-11

Last modified

2025-04-23

Weaknesses

CWE-74

Affected products

• Calendar (Nextcloud)
• Security-advisories (Nextcloud)

References

• https://github.com/nextcloud/calendar/commit/7b70edfb8a0fcf0926f613ababcbd56c6ecd9f35
• https://github.com/nextcloud/calendar/pull/4073
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8xv5-4855-24qf