CVE-2018-3763

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-07-05 · updated 2026-06-17
Weakness: CWE-79

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.

Affected products

Nextcloud Calendar application: before 1.5.8; 1.6.0 — fixed in 1.5.8

How to fix

Upgrade to a fixed version: Nextcloud Calendar application 1.5.8. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2018-3763 or the next vulnerability affects your stack