TI-2022-08650 Aliases CVE-2022-24838

Command Injection in Appointment Emails for Nextcloud Calendar

HIGH 73CWE-74Published 2022-04-11 · Updated 2025-04-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.3302 98th percentileScored 2026-11-07

Fix Fixed security-advisories (nextcloud): 3.2.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nextcloud	security-advisories	before 3.2.2	3.2.2	Patch available	CNA

security-advisories Vendornextcloud Affected before 3.2.2 Fixed in 3.2.2 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nextcloud:calendar::::::::	before 3.2.2	Vulnerable	nextcloud

cpe:2.3:a:nextcloud:calendar:*:*:*:*:*:*:*:* Versions before 3.2.2 Vulnerable ·nextcloud

Remediation

Fix · CNA security-advisories (nextcloud) Fixed in 3.2.2

Timeline

2026-10-02 Threatist record created from CVE-2022-24838

References

Patch 2

Advisory 1

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8xv5-4855-24qf

TI-2023-24171 Inviting excessive long email addresses to a calendar event makes the Nextcloud server unresponsive CVSS 3.1MEDIUM 4.3
TI-2023-26171 Calendar app returns full stacktrace when an error happens while editing appointment CVSS 3.1MEDIUM 6.5
TI-2025-40933 Nextcloud Calendar app used predictable proposal participant tokens CVSS 3.1MEDIUM 6.5
TI-2025-40961 Nextcloud Calendar attachments of local files are offered to downloaded CVSS 3.1MEDIUM 5.7
TI-2018-02759 Cross-site scripting in Nextcloud Calendar application CVSS 3.1MEDIUM 4.8
TI-2024-24828 Nextcloud Calendar's event create can create attachments that link to other websites CVSS 3.1MEDIUM 4.6

See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences