Vulnerability in Nextcloud Calendar
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.330 (98.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.330 · newest: 0.330 · change: 0.000
Affected products
- Nextcloud Calendar
- Nextcloud Security-Advisories — versions < 3.2.2
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-8xv5-4855-24qf (Third Party Advisory)
- github.com/nextcloud/calendar/pull/4073 (Patch, Third Party Advisory)
- github.com/nextcloud/calendar/commit/7b70edfb8a0fcf0926f613ababcbd56c6ecd9f35 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-24838?
- CVE-2022-24838 is a medium-severity vulnerability in Nextcloud Calendar, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.3/10. Published 2022-04-11.
- How severe is CVE-2022-24838?
- Medium severity. CVSS v3 base score is 5.3 out of 10.