← Vulnerability feed

Vulnerability record · CVE-2018-3763 · published 5 July 2018

CVE-2018-3763: Nextcloud calendar cross-site scripting vulnerability

Nextcloud · Calendar

In Nextcloud Calendar before 1.5.8 and 1.6.1, a missing sanitization of search results for an autocomplete field could lead to a stored XSS requiring user-interaction. The missing sanitization only affected group names, hence malicious search results could only be crafted by privileged users like admins or group admins.

4.8 CVSS 3.1 Medium EPSS 0.61% · top 52.6% CWE-79 · Cross-site scripting
4.8CVSS 3.1 base score, v2 3.5
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

In Nextcloud Calendar before 1.5.8 and 1.6.1, a missing sanitization of search results for an autocomplete field could lead to a stored XSS requiring user-interaction. The missing sanitization only affected group names, hence malicious search results could only be crafted by privileged users like admins or group admins.

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://nextcloud.com/security/advisory/?id=nc-sa-2018-004 Broken LinkVendor Advisory
https://nextcloud.com/security/advisory/?id=nc-sa-2018-004 Broken LinkVendor Advisory

Track CVE-2018-3763 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-24838Nextcloud calendar injection vulnerabilityNextcloud Calendar is a calendar application for the nextcloud framework. SMTP Command Injection in Appointment Emails via Newlines: as newlines and …EPSS 33%6.5CVE-2025-66511Nextcloud calendar vulnerabilityNextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash …EPSS 0.30%6.5CVE-2023-48308Nextcloud calendar vulnerabilityNextcloud/Cloud is a calendar app for Nextcloud. An attacker can gain access to stacktrace and internal paths of the server when generating an except…EPSS 0.55%5.7CVE-2025-66550Nextcloud calendar vulnerabilityNextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.17 and 5.2.4, when a malicious user creates a calendar event with a crafted attachme…EPSS 0.34%4.6CVE-2024-37316Nextcloud calendar vulnerabilityNextcloud Calendar is a calendar app for Nextcloud. Authenticated users could create an event with manipulated attachment data leading to a bad redir…EPSS 0.36%4.3CVE-2026-45286Nextcloud calendar information exposure vulnerabilityNextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user c…EPSS 0.46%4.3CVE-2023-45150Nextcloud calendar uncontrolled resource consumption vulnerabilityNextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings …EPSS 0.39%4.3CVE-2023-33183Nextcloud calendar improper authorization vulnerabilityCalendar app for Nextcloud easily sync events from various devices with your Nextcloud. Some internal paths of the website are disclosed when the SMT…EPSS 0.44%

Source: NIST National Vulnerability Database (record CVE-2018-3763), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.